From cdec1838ace902dc1bfaca4c2afdddb01fa75f9d Mon Sep 17 00:00:00 2001
From: iqudoo <iqudoo@qq.com>
Date: Tue, 26 May 2026 02:37:01 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96++?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                       |   16 +-
 demo.html                       |    6 -
 dist/index.d.ts                 |  132 +++-
 dist/index.html                 |    7 +-
 dist/index.js                   |    2 +-
 dist/index.md                   |   16 +-
 src/_core.js                    |   40 +-
 src/_export.js                  |   35 +-
 src/index.js                    |    8 +-
 src/polyfill/_es6.js            |    7 +
 src/services/embedScanBridge.js |   12 +
 src/services/provider/scan.js   |  375 +++++++--
 src/services/web/index.js       | 1267 +++++++++++++++++++++++++++----
 types/index.d.ts                |  132 +++-
 14 files changed, 1788 insertions(+), 267 deletions(-)

diff --git a/README.md b/README.md
index d3fe011..f501659 100644
--- a/README.md
+++ b/README.md
@@ -61,9 +61,6 @@ IScan.config({
 // 自动选择可用扫码方式：桥接 -> 微信 -> Web 摄像头 -> 图片识别
 IScan.startScan();
 
-// 仅打开 Web 视频扫码
-IScan.scanVideo();
-
 // 仅选择图片识别
 IScan.scanImage();
 
@@ -126,6 +123,11 @@ interface ScanConfigOptions {
 | `webScanImageFallbackOnVideoError` | 摄像头不可用或打开失败时，是否自动弹出拍照/选图（适用于部分安卓内置浏览器） | `true` |
 | `webScanVideoAccessTimeout` | 打开摄像头超时（毫秒），超时后走图片回退 | `10000` |
 | `webScanVideoReadyTimeout` | 摄像头已开但无画面超时（毫秒），超时后走图片回退 | `8000` |
+| `webScanCameraPermissionDialogEnabled` | `startScan` 走 Web 摄像头前是否先展示权限说明弹窗 | `true` |
+| `webScanCameraPermissionTitle` | 权限说明弹窗标题 | `需要使用摄像头` |
+| `webScanCameraPermissionMessage` | 权限说明弹窗正文 | 见类型定义默认值 |
+| `webScanCameraPermissionConfirmText` | 确认按钮文案 | `继续` |
+| `webScanCameraPermissionCancelText` | 取消按钮文案 | `取消` |
 | `scanBeepAudio` | 扫码成功提示音地址（任意模式匹配成功时播放） | 内置提示音 |
 | `scanBeepEnabled` | 扫码成功是否播放提示音 | `true` |
 | `initWechatJssdk` | 微信 JSSDK 初始化配置，仅微信环境生效 | 无 |
@@ -292,14 +294,6 @@ console.log(IScan.getStatus());
 IScan.startScan();
 ```
 
-### `scanVideo(): void`
-
-直接开启 Web 摄像头扫码。扫码结果通过 `onScanListener` 回调。
-
-```js
-IScan.scanVideo();
-```
-
 ### `scanImage(): void`
 
 直接选择图片进行识别。识别结果通过 `onScanListener` 回调。
diff --git a/demo.html b/demo.html
index 963c142..b35df38 100644
--- a/demo.html
+++ b/demo.html
@@ -207,7 +207,6 @@
       <p>点击开始后，会按桥接、微信、Web 摄像头、图片识别的顺序选择可用扫码方式。</p>
       <div class="actions">
         <button onclick="startScan()" class="btn">开始扫码</button>
-        <button onclick="scanVideo()" class="btn secondary">开启视频扫码</button>
         <button onclick="scanImage()" class="btn secondary">选择图片识别</button>
         <button onclick="stopScan()" class="btn secondary">停止扫码</button>
       </div>
@@ -247,7 +246,6 @@
 
 IScan.startScan();
 IScan.scanImage();
-IScan.scanVideo();
 IScan.stopScan();</pre>
     </section>
   </main>
@@ -349,10 +347,6 @@ IScan.stopScan();</pre>
       IScan.scanImage();
     }
 
-    function scanVideo() {
-      IScan.scanVideo();
-    }
-
     ready();
   </script>
 </body>
diff --git a/dist/index.d.ts b/dist/index.d.ts
index 560ca55..a5b6f3e 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -45,6 +45,58 @@ interface ScanConfigOptions {
   * 2. 结束扫码的方法名称为：stopScan
   */
   bridgeName?: string,
+  /**
+   * 桥接扫码超时（毫秒），超时后回退 Web/图片识别，默认 5000
+   */
+  bridgeScanTimeout?: number,
+  /**
+   * 是否允许 H5 摄像头扫码：true 强制开启（仍需有媒体 API），false 强制关闭
+   */
+  webScanCameraEnabled?: boolean,
+  /**
+   * @deprecated 请用 webScanCameraEnabled；保留兼容
+   */
+  webScanCameraInWechat?: boolean,
+  /**
+   * @deprecated 摄像头权限已后置到 startScan，请用 webScanVideoAccessTimeout
+   */
+  webScanCameraProbeTimeout?: number,
+  /**
+   * startScan 走 Web 摄像头前是否展示权限说明弹窗，默认 true
+   */
+  webScanCameraPermissionDialogEnabled?: boolean,
+  /**
+   * 摄像头权限说明弹窗标题
+   */
+  webScanCameraPermissionTitle?: string,
+  /**
+   * 摄像头权限说明弹窗正文
+   */
+  webScanCameraPermissionMessage?: string,
+  /**
+   * 摄像头权限说明弹窗确认按钮文案
+   */
+  webScanCameraPermissionConfirmText?: string,
+  /**
+   * 摄像头权限说明弹窗取消按钮文案
+   */
+  webScanCameraPermissionCancelText?: string,
+  /**
+   * 选图后延迟读取 file 对象（毫秒），微信/安卓 WebView 默认 100
+   */
+  webScanFileReadDelay?: number,
+  /**
+   * 强制使用 WASM ponyfill 识别（微信/部分 WebView 建议开启，默认微信内自动开启）
+   */
+  webScanPreferPonyfill?: boolean,
+  /**
+   * WASM 文件完整 URL；未配置时相对 SDK 脚本地址解析 lib/reader.wasm
+   */
+  webScanWasmUrl?: string,
+  /**
+   * WASM 基准路径（SDK 脚本 URL 或目录）；用于 async/defer 加载时修正 reader.wasm 路径
+   */
+  webScanWasmBaseUrl?: string,
   /**
    * webScan是否启用，默认启用
    */
@@ -101,6 +153,41 @@ interface ScanConfigOptions {
    * 摄像头已打开但长时间无画面时触发图片回退（毫秒），默认 8000
    */
   webScanVideoReadyTimeout?: number,
+  /**
+   * 图片/回退识别时 detect 超时（毫秒），默认 15000
+   */
+  webScanDetectTimeout?: number,
+  /**
+   * 图片识别是否优先使用 ZXing ponyfill（原生 detect 在部分 WebView 可能卡住），默认 true
+   */
+  webScanImagePreferPonyfill?: boolean,
+  /**
+   * 移动端图片回退是否使用 capture 拍照（false 为相册选图，兼容性更好），默认 false
+   */
+  webScanImagePreferCapture?: boolean,
+  /**
+   * 图片识别是否优先 canvas 解码（安卓 WebView 建议开启），默认在安卓/微信内自动开启
+   */
+  webScanImageDetectPreferCanvas?: boolean,
+  /**
+   * ZXing WASM 加载超时（毫秒），默认 20000
+   */
+  webScanPrepareTimeout?: number,
+  /**
+   * 选图等待超时（毫秒），默认 120000
+   */
+  webScanChooseImageTimeout?: number,
+  /**
+   * 选图方式：button=显示「选择图片」按钮（安卓/微信默认，需用户点击）；auto=自动弹出系统选图
+   */
+  webScanImagePickerMode?: 'auto' | 'button',
+  webScanImagePickerTitle?: string,
+  webScanImagePickerButtonText?: string,
+  webScanImagePickerCancelText?: string,
+  /**
+   * 单次扫码会话超时（毫秒），超时后状态恢复 ready，默认 90000
+   */
+  scanSessionTimeout?: number,
   /**
    * 扫码成功提示音地址，默认使用内置提示音；任意识别模式匹配成功时播放
    */
@@ -161,6 +248,16 @@ interface ScanResult {
   key: string
 }
 
+/**
+ * 扫码错误
+ */
+interface ScanErrorInfo {
+  error: string,
+  key: string,
+  source?: string,
+  cancel?: number
+}
+
 /**
  * 监听key
  */
@@ -197,6 +294,22 @@ type ScanStatus = "scanning" | "ready";
  */
 type ScanResultCallback = (result: ScanResult) => any;
 
+/**
+ * 监听扫码错误回调
+ */
+type ScanErrorCallback = (error: ScanErrorInfo) => any;
+
+/**
+ * 扫码错误监听信息
+ */
+interface ScanErrorListenerInfo {
+  key?: string;
+  match?: string;
+  level?: number;
+  listener: ScanErrorCallback;
+  cancel: () => void;
+}
+
 /**
  * 监听状态回调
  */
@@ -227,6 +340,19 @@ interface IScan {
    * @param callback 监听回调，或监听key
    */
   offScanListener(callback: ScanResultCallback | string): void;
+  /**
+   * 添加监听扫码错误（如图片识别失败）
+   * @param callback 错误回调
+   * @param key 监听 key
+   * @param match 可选正则，匹配 error 文本后回调
+   * @param level 优先级
+   */
+  onScanErrorListener(callback: ScanErrorCallback, key: string, match?: string, level?: number): ScanErrorListenerInfo;
+  /**
+   * 取消监听扫码错误
+   * @param callback 监听回调，或监听 key
+   */
+  offScanErrorListener(callback: ScanErrorCallback | string): void;
   /**
    * 获取扫码状态
    * @returns ScanStatus
@@ -240,14 +366,12 @@ interface IScan {
    * 开启扫码
    */
   startScan(): void;
-  /**
-   * 开启视频扫码
-   */
-  scanVideo(): void;
   /**
    * 选择图片进行识别
    */
   scanImage(): void;
+  /** 由业务/原生传入已选图片 File 识别（WebView input.files 异常时使用） */
+  scanImageFromFile(file: File | Blob): void;
   /**
    * 清除全部监听
    */
diff --git a/dist/index.html b/dist/index.html
index de3ad3f..8bcb152 100644
--- a/dist/index.html
+++ b/dist/index.html
@@ -161,7 +161,7 @@
 
     section {
       margin-bottom: 16px;
-    }</style></head><body><main class="page"><section class="hero"><h1>IScan 通用扫码SDK</h1><p>统一接入桥接扫码、微信小程序、微信 JSSDK 扫码、Web 摄像头扫码、图片识别和扫码枪输入。</p></section><section class="grid"><div class="card"><h2>功能说明</h2><ul class="feature-list"><li>支持桥接扫码、微信 JSSDK 扫码、Web 摄像头扫码、图片识别和扫码枪输入。</li><li>浏览器环境使用WASM库识别二维码和条形码。</li><li>扫码结果由监听规则统一回调，支持正则匹配和优先级排序。</li></ul></div><div class="card"><h2>当前状态</h2><p>SDK 状态：<span id="status" class="status">loading</span></p><p>运行环境：</p><pre id="output" class="panel"></pre></div></section><section class="card"><h2>操作</h2><p>点击开始后，会按桥接、微信、Web 摄像头、图片识别的顺序选择可用扫码方式。</p><div class="actions"><button onclick="startScan()" class="btn">开始扫码</button> <button onclick="scanVideo()" class="btn secondary">开启视频扫码</button> <button onclick="scanImage()" class="btn secondary">选择图片识别</button> <button onclick="stopScan()" class="btn secondary">停止扫码</button></div></section><section class="card"><h2>扫码结果</h2><pre id="result" class="panel result"></pre></section><section class="card"><h2>错误信息</h2><pre id="error" class="panel error"></pre><p style="color: #919191">错误信息可能来源于扫码结果、扫码过程、扫码初始化等。</p></section><section class="card code"><h2>接入方式</h2><pre>IScan.config({
+    }</style></head><body><main class="page"><section class="hero"><h1>IScan 通用扫码SDK</h1><p>统一接入桥接扫码、微信小程序、微信 JSSDK 扫码、Web 摄像头扫码、图片识别和扫码枪输入。</p></section><section class="grid"><div class="card"><h2>功能说明</h2><ul class="feature-list"><li>支持桥接扫码、微信 JSSDK 扫码、Web 摄像头扫码、图片识别和扫码枪输入。</li><li>浏览器环境使用WASM库识别二维码和条形码。</li><li>扫码结果由监听规则统一回调，支持正则匹配和优先级排序。</li></ul></div><div class="card"><h2>当前状态</h2><p>SDK 状态：<span id="status" class="status">loading</span></p><p>运行环境：</p><pre id="output" class="panel"></pre></div></section><section class="card"><h2>操作</h2><p>点击开始后，会按桥接、微信、Web 摄像头、图片识别的顺序选择可用扫码方式。</p><div class="actions"><button onclick="startScan()" class="btn">开始扫码</button> <button onclick="scanImage()" class="btn secondary">选择图片识别</button> <button onclick="stopScan()" class="btn secondary">停止扫码</button></div></section><section class="card"><h2>扫码结果</h2><pre id="result" class="panel result"></pre></section><section class="card"><h2>错误信息</h2><pre id="error" class="panel error"></pre><p style="color: #919191">错误信息可能来源于扫码结果、扫码过程、扫码初始化等。</p></section><section class="card code"><h2>接入方式</h2><pre>IScan.config({
   webScanEnabled: true,
   webScanCanvasEnabled: true,
   webScanCloseButtonStyle: "background: rgba(27, 99, 244, 0.88);",
@@ -182,7 +182,6 @@
 
 IScan.startScan();
 IScan.scanImage();
-IScan.scanVideo();
 IScan.stopScan();</pre></section></main><script>(function () {
       output(window.navigator.userAgent);
       window.onerror = function (message, source, lineno, colno, err) {
@@ -279,8 +278,4 @@ IScan.stopScan();</pre></section></main><script>(function () {
       IScan.scanImage();
     }
 
-    function scanVideo() {
-      IScan.scanVideo();
-    }
-
     ready();</script><script src="index.js"></script></body></html>
\ No newline at end of file
diff --git a/dist/index.js b/dist/index.js
index 4441ebc..368fbe6 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1 +1 @@
-!function(e){var t={};function r(n){if(t[n])return t[n].exports;var o=t[n]={i:n,l:!1,exports:{}};return e[n].call(o.exports,o,o.exports,r),o.l=!0,o.exports}r.m=e,r.c=t,r.d=function(e,t,n){r.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:n})},r.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},r.t=function(e,t){if(1&t&&(e=r(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)r.d(n,o,function(t){return e[t]}.bind(null,o));return n},r.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return r.d(t,"a",t),t},r.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},r.p="",r(r.s=11)}([function(e,t,r){"use strict";t.__esModule=!0;var n="function"==typeof 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\ No newline at end of file
diff --git a/dist/index.md b/dist/index.md
index d3fe011..f501659 100644
--- a/dist/index.md
+++ b/dist/index.md
@@ -61,9 +61,6 @@ IScan.config({
 // 自动选择可用扫码方式：桥接 -> 微信 -> Web 摄像头 -> 图片识别
 IScan.startScan();
 
-// 仅打开 Web 视频扫码
-IScan.scanVideo();
-
 // 仅选择图片识别
 IScan.scanImage();
 
@@ -126,6 +123,11 @@ interface ScanConfigOptions {
 | `webScanImageFallbackOnVideoError` | 摄像头不可用或打开失败时，是否自动弹出拍照/选图（适用于部分安卓内置浏览器） | `true` |
 | `webScanVideoAccessTimeout` | 打开摄像头超时（毫秒），超时后走图片回退 | `10000` |
 | `webScanVideoReadyTimeout` | 摄像头已开但无画面超时（毫秒），超时后走图片回退 | `8000` |
+| `webScanCameraPermissionDialogEnabled` | `startScan` 走 Web 摄像头前是否先展示权限说明弹窗 | `true` |
+| `webScanCameraPermissionTitle` | 权限说明弹窗标题 | `需要使用摄像头` |
+| `webScanCameraPermissionMessage` | 权限说明弹窗正文 | 见类型定义默认值 |
+| `webScanCameraPermissionConfirmText` | 确认按钮文案 | `继续` |
+| `webScanCameraPermissionCancelText` | 取消按钮文案 | `取消` |
 | `scanBeepAudio` | 扫码成功提示音地址（任意模式匹配成功时播放） | 内置提示音 |
 | `scanBeepEnabled` | 扫码成功是否播放提示音 | `true` |
 | `initWechatJssdk` | 微信 JSSDK 初始化配置，仅微信环境生效 | 无 |
@@ -292,14 +294,6 @@ console.log(IScan.getStatus());
 IScan.startScan();
 ```
 
-### `scanVideo(): void`
-
-直接开启 Web 摄像头扫码。扫码结果通过 `onScanListener` 回调。
-
-```js
-IScan.scanVideo();
-```
-
 ### `scanImage(): void`
 
 直接选择图片进行识别。识别结果通过 `onScanListener` 回调。
diff --git a/src/_core.js b/src/_core.js
index 49f86a1..dd6aed1 100644
--- a/src/_core.js
+++ b/src/_core.js
@@ -1,12 +1,19 @@
 import './polyfill';
 import {
   supportList,
-  onScanListener, offScanListener, setStatusListener, getStatus,
-  startScan, stopScan, scanVideo, scanImage, clear
+  onScanListener, offScanListener,
+  onScanErrorListener, offScanErrorListener,
+  setStatusListener, getStatus,
+  startScan, stopScan, scanImage, scanImageFromFile, clear
 } from './services/provider/scan';
 import { setConfig, getVersion } from './services/config';
 import { initWxJssdk } from './services/wx';
-import { printDebug } from './utils/logger';
+import {
+  isSupportWebScan,
+  prepareWebScanBarcodeDetector,
+  isSupportImageScan
+} from './services/web';
+import { printDebug, printWarn } from './utils/logger';
 
 let _readyPromise = null;
 let _calledReady = false;
@@ -23,18 +30,25 @@ function config(config) {
     return _readyPromise;
   }
   _readyPromise = Promise.resolve().then(() => {
+    return initWxJssdk().catch(err => {
+      printDebug('init wx jssdk failed:', err && err.message ? err.message : err);
+    });
+  }).then(() => {
     printDebug('-------------------------------------');
     printDebug('sdk_version:', getVersion());
     printDebug('support_list:', supportList.map(item => item.name + ':' + item.support).join(', '));
     printDebug('-------------------------------------');
-    initWxJssdk();
-    return Promise.resolve().then(() => {
-      _calledReady = true;
-    }).catch(err => {
-      _readyPromise = null;
-      throw err;
-    });
-  })
+    if (isSupportWebScan() || isSupportImageScan()) {
+      return prepareWebScanBarcodeDetector().catch(err => {
+        printWarn('prepare barcode detector failed:', err);
+      });
+    }
+  }).then(() => {
+    _calledReady = true;
+  }).catch(err => {
+    _readyPromise = null;
+    throw err;
+  });
   return _readyPromise;
 }
 
@@ -42,11 +56,13 @@ export default Object.assign({}, {
   config,
   onScanListener,
   offScanListener,
+  onScanErrorListener,
+  offScanErrorListener,
   setStatusListener,
   getStatus,
   startScan,
   stopScan,
-  scanVideo,
   scanImage,
+  scanImageFromFile,
   clear,
 });
\ No newline at end of file
diff --git a/src/_export.js b/src/_export.js
index 33058cc..917abb9 100644
--- a/src/_export.js
+++ b/src/_export.js
@@ -13,8 +13,12 @@ import { createUUID } from "./utils/uuid";
 import {
   dispatchEmbedScanResult,
   acknowledgeEmbedScanConsumed,
+  dispatchEmbedScanError,
 } from "./services/provider/scan";
-import { setEmbedScanResultForwarder } from "./services/embedScanBridge";
+import {
+  setEmbedScanResultForwarder,
+  setEmbedScanErrorForwarder,
+} from "./services/embedScanBridge";
 
 const EMBED_SOURCE = "IScanEmbed";
 const EMBED_V = 1;
@@ -25,6 +29,8 @@ const embedChildSources = new Set();
 const EMBED_LISTENER_METHODS = new Set([
   "onScanListener",
   "offScanListener",
+  "onScanErrorListener",
+  "offScanErrorListener",
   "clear",
 ]);
 
@@ -105,6 +111,26 @@ function hydrateEmbedParams(params, messageSource, targetOrigin) {
   return params.map(walk);
 }
 
+function broadcastScanErrorToEmbedChildren(error) {
+  if (embedChildSources.size === 0 || error == null || error === "") {
+    return;
+  }
+  embedChildSources.forEach((source) => {
+    try {
+      source.postMessage(
+        {
+          source: EMBED_SOURCE,
+          v: EMBED_V,
+          kind: "forwardScanError",
+          error,
+        },
+        "*"
+      );
+    } catch (e) {
+    }
+  });
+}
+
 function broadcastScanResultToEmbedChildren(result) {
   if (embedChildSources.size === 0 || result == null || result === "") {
     return;
@@ -198,6 +224,12 @@ function embedChildOnMessage(ev) {
     }
     return;
   }
+  if (data.kind === "forwardScanError") {
+    if (typeof data.error === "string") {
+      dispatchEmbedScanError(data.error);
+    }
+    return;
+  }
   if (data.kind === "invokeResult") {
     const pending = pendingInvokes[data.id];
     if (!pending) {
@@ -307,6 +339,7 @@ export function installEmbedHost(lib) {
   }
   embedHostInstalled = true;
   setEmbedScanResultForwarder(broadcastScanResultToEmbedChildren);
+  setEmbedScanErrorForwarder(broadcastScanErrorToEmbedChildren);
   window.addEventListener("message", (ev) => {
     const data = ev.data;
     if (!isEmbedMessage(data)) {
diff --git a/src/index.js b/src/index.js
index 63010fc..8e38c1f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,9 +1,15 @@
+import './polyfill';
 import core from "./_core";
 import _global from './polyfill/_global';
 import { exportSDK, installEmbedHost } from './_export';
+import { setSdkScriptSrc } from './services/web';
+
+if (typeof document !== 'undefined' && document.currentScript && document.currentScript.src) {
+  setSdkScriptSrc(document.currentScript.src);
+}
 
 const IScan = exportSDK(core, null, "config", "setStatusListener", "onScanListener",
-  "offScanListener", "stopScan", "startScan", "scanImage", "clear");
+  "offScanListener", "onScanErrorListener", "offScanErrorListener", "stopScan", "startScan", "scanImage", "scanImageFromFile", "clear");
 
 installEmbedHost(core);
 
diff --git a/src/polyfill/_es6.js b/src/polyfill/_es6.js
index da00dbd..c670e79 100644
--- a/src/polyfill/_es6.js
+++ b/src/polyfill/_es6.js
@@ -1,5 +1,12 @@
 import { polyfill } from 'es6-promise';
 
+// Object.hasOwn (ES2022) — barcode-detector / ZXing 依赖，旧版 WebView 无此方法
+if (typeof Object.hasOwn !== 'function') {
+  Object.hasOwn = function hasOwn(object, key) {
+    return Object.prototype.hasOwnProperty.call(object, key);
+  };
+}
+
 // Object.assign
 if (typeof Object.assign != 'function') {
     // Must be writable: true, enumerable: false, configurable: true
diff --git a/src/services/embedScanBridge.js b/src/services/embedScanBridge.js
index 1954445..b420869 100644
--- a/src/services/embedScanBridge.js
+++ b/src/services/embedScanBridge.js
@@ -1,12 +1,24 @@
 /** 父页识别到扫码结果时，向嵌入 iframe 转发的回调（由 installEmbedHost 注册） */
 let embedScanResultForwarder = null;
+/** 父页图片识别失败时，向嵌入 iframe 转发的回调 */
+let embedScanErrorForwarder = null;
 
 export function setEmbedScanResultForwarder(fn) {
   embedScanResultForwarder = typeof fn === "function" ? fn : null;
 }
 
+export function setEmbedScanErrorForwarder(fn) {
+  embedScanErrorForwarder = typeof fn === "function" ? fn : null;
+}
+
 export function forwardEmbedScanResultIfNeeded(result) {
   if (embedScanResultForwarder && result != null && result !== "") {
     embedScanResultForwarder(result);
   }
 }
+
+export function forwardEmbedScanErrorIfNeeded(error) {
+  if (embedScanErrorForwarder && error != null && error !== "") {
+    embedScanErrorForwarder(error);
+  }
+}
diff --git a/src/services/provider/scan.js b/src/services/provider/scan.js
index d83106b..c53703a 100644
--- a/src/services/provider/scan.js
+++ b/src/services/provider/scan.js
@@ -7,28 +7,83 @@ import {
   startScanForImage,
   unlockScanBeep,
   playScanBeep,
-  isWebScanImageFallbackEnabled
+  isWebScanImageFallbackEnabled,
+  canUseWebCameraScan,
+  shouldSkipWebCameraProbe,
+  cleanupWebScanResiduals,
+  detectImageFileForScan
 } from "../web";
-import { isSupportWxScan, startScanForWx } from "../wx";
+import { isSupportWxScan, startScanForWx, isWxEnv } from "../wx";
 import { startScanner, stopScanner } from "../scanner";
 import { getConfig } from "../config";
 import { toAny } from "../../utils/toany";
-import { printDebug } from "../../utils/logger";
-import { forwardEmbedScanResultIfNeeded } from "../embedScanBridge";
+import { printDebug, printWarn } from "../../utils/logger";
+import { forwardEmbedScanResultIfNeeded, forwardEmbedScanErrorIfNeeded } from "../embedScanBridge";
 
 let _scan_status = "ready";
 let _scan_status_listener = null;
 let _scan_listener_list = [];
+let _scan_error_listener_list = [];
 let _scan_resolve = null;
 let _scan_closing = false;
 let _scan_next_start_time = 0;
 
 const SCAN_RESTART_DELAY = 500;
+const BRIDGE_SCAN_TIMEOUT = 5000;
+const SCAN_SESSION_TIMEOUT = 90000;
 
 function getScanRestartDelay() {
   return toAny(getConfig("scanRestartDelay"), SCAN_RESTART_DELAY);
 }
 
+function getBridgeScanTimeout() {
+  const timeout = getConfig("bridgeScanTimeout");
+  return typeof timeout === "number" && timeout > 0 ? timeout : BRIDGE_SCAN_TIMEOUT;
+}
+
+function getScanSessionTimeout() {
+  const timeout = getConfig("scanSessionTimeout");
+  return typeof timeout === "number" && timeout > 0 ? timeout : SCAN_SESSION_TIMEOUT;
+}
+
+function withScanSessionTimeout(scanPromise) {
+  return Promise.race([
+    scanPromise,
+    new Promise(resolve => {
+      setTimeout(() => {
+        printWarn("scan session timeout");
+        resolve({ cancel: 1, scanTimeout: true });
+      }, getScanSessionTimeout());
+    })
+  ]);
+}
+
+function __fallbackScanAfterBridgeFailure(err) {
+  if (!isScanning()) {
+    throw err;
+  }
+  printWarn("bridge scan unavailable, fallback:", err);
+  return __startNonBridgeScan(err);
+}
+
+function __fallbackScanAfterWxFailure(err) {
+  if (!isScanning()) {
+    throw err;
+  }
+  printWarn("wx scan unavailable, fallback to web/image scan:", err);
+  return __startNonBridgeScan(err);
+}
+
+function __startNonBridgeScan(err) {
+  if (isSupportWebScan()) {
+    return __startWebScan();
+  }
+  if (isSupportImageScan()) {
+    return __startImageScan();
+  }
+  throw err;
+}
+
 function parseBarcodeString(input) {
   // 标准化的类型映射表：将各种变体映射到统一标识
   // 这样即使传入 EAN_13、EAN-13、EAN13 都能匹配成功
@@ -120,6 +175,68 @@ function __result(result) {
   return matched;
 }
 
+function normalizeScanError(raw) {
+  if (typeof raw === "string") {
+    return raw;
+  }
+  if (raw && raw.error != null && raw.error !== "") {
+    return String(raw.error);
+  }
+  if (raw && raw.message) {
+    return String(raw.message);
+  }
+  if (raw == null || raw === "") {
+    return "";
+  }
+  return String(raw);
+}
+
+function __scanError(raw, meta) {
+  const error = normalizeScanError(raw);
+  if (!error) {
+    return false;
+  }
+  forwardEmbedScanErrorIfNeeded(error);
+  let matched = false;
+  for (let i = 0; i < _scan_error_listener_list.length; i++) {
+    const item = _scan_error_listener_list[i];
+    if (item.listener && __match(error, item.match)) {
+      matched = true;
+      item.listener(Object.assign({
+        error,
+        key: item.key
+      }, meta || {}));
+      break;
+    }
+  }
+  return matched;
+}
+
+function __notifyImageScanFailure(raw, meta) {
+  if (raw && raw.cancel) {
+    return false;
+  }
+  const error = normalizeScanError(raw);
+  const notified = __scanError(raw, Object.assign({ source: "image" }, meta || {}));
+  if (!notified && error) {
+    printWarn("image scan failed:", error);
+  }
+  return notified;
+}
+
+function __notifyWebScanFailure(raw, meta) {
+  if (raw && raw.cancel) {
+    return false;
+  }
+  const payload = raw && raw.error != null ? raw.error : raw;
+  const error = normalizeScanError(payload);
+  const notified = __scanError(payload, Object.assign({ source: "web" }, meta || {}));
+  if (!notified && error) {
+    printWarn("web scan failed:", error);
+  }
+  return notified;
+}
+
 function __hasMatchedListener(result) {
   for (let i = 0; i < _scan_listener_list.length; i++) {
     const item = _scan_listener_list[i];
@@ -178,6 +295,15 @@ export function dispatchEmbedScanResult(raw) {
   return __scannerResult(result);
 }
 
+/**
+ * 父页通过 postMessage 将识别错误投递到嵌入 iframe 时调用。
+ * @returns {boolean} 是否有监听消费了该错误
+ */
+export function dispatchEmbedScanError(raw) {
+  const error = normalizeScanError(raw);
+  return __scanError(error, { source: "image" });
+}
+
 /**
  * 嵌入 iframe 已消费扫码结果时通知父页结束当前识别（关闭摄像头/UI 等）。
  */
@@ -222,7 +348,7 @@ function __scannerResult(result) {
 function __startBridgeScan() {
   return bridgeAsync("startScan", {
     closeable: true
-  }).then(resp => {
+  }, getBridgeScanTimeout()).then(resp => {
     if (!isScanning()) {
       return resp;
     }
@@ -238,10 +364,10 @@ function __startBridgeScan() {
     return resp;
   }).catch(err => {
     if (!isScanning()) {
-      return err;
+      throw err;
     }
     if (!err || !err.result) {
-      return err;
+      throw err;
     }
     if (__result(err.result)) {
       return err;
@@ -261,6 +387,9 @@ function __startWxScan() {
     if (!isScanning()) {
       return resp;
     }
+    if (resp && resp.error && !resp.result) {
+      throw resp.error;
+    }
     if (!resp || !resp.result) {
       return resp;
     }
@@ -270,43 +399,50 @@ function __startWxScan() {
     return resp;
   }).catch(err => {
     if (!isScanning()) {
+      throw err;
+    }
+    if (err && err.result) {
+      if (__result(err.result)) {
+        return err;
+      }
       return err;
     }
-    if (!err || !err.result) {
-      return err;
-    }
-    if (__result(err.result)) {
-      return err;
-    }
-    return err;
+    return __fallbackScanAfterWxFailure(err);
   });
 }
 
-function __startWebScan() {
-  return startScanForWeb(__result).then(resp => {
+function __startWebScan(useImageScan = false) {
+  return startScanForWeb(__result, __scanError).then(resp => {
     if (!isScanning()) {
       return resp;
     }
     if (!resp || !resp.result) {
+      if (resp && resp.success === false) {
+        __notifyWebScanFailure(resp);
+      }
       return resp;
     }
-    if (__result(resp.result)) {
-      return resp;
-    }
-    if (isScanning()) {
-      return __startWebScan();
-    }
+    __result(resp.result);
     return resp;
   }).catch(err => {
     if (!isScanning()) {
       return err;
     }
-    if (err && err.cancel || err && err.imageFallbackUsed) {
+    if (err && err.cancel) {
       return err;
     }
-    if (isWebScanImageFallbackEnabled()) {
+    if (err && err.scanTimeout) {
+      return err;
+    }
+    if (err && err.imageFallbackUsed) {
+      __notifyWebScanFailure(err);
+      return err;
+    }
+    if (isWebScanImageFallbackEnabled() && useImageScan) {
       return __startImageScan();
     }
+    __notifyWebScanFailure(err);
+    printWarn("web scan failed:", err);
     return err;
   });
 }
@@ -316,29 +452,27 @@ function __startImageScan() {
     if (!isScanning()) {
       return resp;
     }
+    if (resp && resp.cancel) {
+      return resp;
+    }
     if (!resp || !resp.result) {
+      __notifyImageScanFailure(resp);
       return resp;
     }
-    if (__result(resp.result)) {
-      return resp;
-    }
-    if (isScanning()) {
-      return __startImageScan();
-    }
+    __result(resp.result);
     return resp;
   }).catch(err => {
     if (!isScanning()) {
       return err;
     }
-    if (!err || !err.result) {
+    if (err && err.cancel) {
       return err;
     }
-    if (__result(err.result)) {
+    if (err && err.result) {
+      __result(err.result);
       return err;
     }
-    if (isScanning()) {
-      return __startImageScan();
-    }
+    __notifyImageScanFailure(err);
     return err;
   });
 }
@@ -353,6 +487,11 @@ export function clear() {
     item.cancel();
   }
   _scan_listener_list.length = 0;
+  for (let i = 0; i < _scan_error_listener_list.length; i++) {
+    const item = _scan_error_listener_list[i];
+    item.cancel();
+  }
+  _scan_error_listener_list.length = 0;
   __checkScanner();
 }
 
@@ -416,6 +555,68 @@ export function offScanListener(listener) {
   __checkScanner();
 }
 
+function createScanErrorListenerItem(listener, key, match, level) {
+  const item = {
+    key,
+    match: match || "",
+    level: level || 0,
+    listener: listener,
+    cancel: () => {
+      const index = _scan_error_listener_list.indexOf(item);
+      if (index !== -1) {
+        const items = _scan_error_listener_list.splice(index, 1);
+        for (let i = 0; i < items.length; i++) {
+          const removed = items[i];
+          removed.listener && removed.listener({ cancel: 1, key: removed.key });
+        }
+      }
+    }
+  };
+  return item;
+}
+
+export function onScanErrorListener(listener, key, match, level) {
+  if (!key || typeof key !== 'string') {
+    return;
+  }
+  if (typeof listener !== 'function') {
+    return;
+  }
+  let item = null;
+  for (let i = 0; i < _scan_error_listener_list.length; i++) {
+    const _i = _scan_error_listener_list[i];
+    if (_i.key === key) {
+      item = _i;
+      break;
+    }
+  }
+  if (item) {
+    item.level = level;
+    item.match = match;
+    item.listener = listener;
+  } else {
+    item = createScanErrorListenerItem(listener, key, match, level);
+    _scan_error_listener_list.push(item);
+  }
+  _scan_error_listener_list.sort((a, b) => b.level - a.level);
+  return item;
+}
+
+export function offScanErrorListener(listener) {
+  for (let i = 0; i < _scan_error_listener_list.length; i++) {
+    const _i = _scan_error_listener_list[i];
+    if (typeof listener === 'string') {
+      if (_i.key === listener) {
+        _i.cancel();
+        break;
+      }
+    } else if (_i.listener === listener) {
+      _i.cancel();
+      break;
+    }
+  }
+}
+
 export function setStatusListener(listener) {
   if (typeof listener !== 'function') {
     return;
@@ -428,11 +629,15 @@ export function getStatus() {
 }
 
 export function stopScan() {
+  cleanupWebScanResiduals();
   if (!isScanning()) {
     return;
   }
+  const resolve = __finishScan();
+  _scan_closing = true;
   __stopCurrentScan().then(() => {
-    __closed();
+    resolve && resolve({ cancel: 1 });
+    _scan_closing = false;
   });
 }
 
@@ -448,45 +653,23 @@ export function startScan() {
     });
     let scanPromise = Promise.resolve();
     if (inRuntime()) {
-      scanPromise = __startBridgeScan();
+      scanPromise = __startBridgeScan().catch(__fallbackScanAfterBridgeFailure);
     } else if (isSupportWxScan()) {
       scanPromise = __startWxScan();
     } else if (isSupportWebScan()) {
-      scanPromise = __startWebScan();
+      scanPromise = __startWebScan(true);
     } else if (isSupportImageScan()) {
       scanPromise = __startImageScan();
     } else {
-      printDebug("Not support scanner");
+      printWarn("Not support scanner");
     }
-    return Promise.race([scanPromise, scannerPromise]);
+    return withScanSessionTimeout(Promise.race([scanPromise, scannerPromise]));
   }).finally(() => {
     _scan_resolve = null;
     __closed();
   });
 }
 
-export function scanVideo() {
-  if (!isSupportWebScan()) {
-    printDebug("Not support video scanner");
-    return;
-  }
-  if (isScanning() || _scan_closing || Date.now() < _scan_next_start_time) {
-    return;
-  }
-  unlockScanBeep();
-  Promise.resolve().then(() => {
-    __scanning();
-    return startScanForWeb(__result).then(resp => {
-      if (resp && resp.result) {
-        __result(resp.result);
-      }
-      throw resp.error;
-    }).catch(err => { });
-  }).finally(() => {
-    __closed();
-  });
-}
-
 export function scanImage() {
   if (!isSupportImageScan()) {
     printDebug("Not support image scanner");
@@ -496,14 +679,49 @@ export function scanImage() {
     return;
   }
   unlockScanBeep();
-  Promise.resolve().then(() => {
-    __scanning();
-    return startScanForImage().then(resp => {
-      if (resp && resp.result) {
-        __result(resp.result);
+  __scanning();
+  withScanSessionTimeout(__startImageScan()).catch(err => {
+    if (err && err.cancel) {
+      return;
+    }
+    __notifyImageScanFailure(err);
+  }).finally(() => {
+    __closed();
+  });
+}
+
+/** 由原生/业务传入已选图片 File，避免 WebView 无法从 input.files 取文件 */
+export function scanImageFromFile(file) {
+  if (!isSupportImageScan()) {
+    printDebug("Not support image scanner");
+    return;
+  }
+  if (isScanning() || _scan_closing || Date.now() < _scan_next_start_time) {
+    return;
+  }
+  unlockScanBeep();
+  cleanupWebScanResiduals();
+  __scanning();
+  withScanSessionTimeout(
+    detectImageFileForScan(file).then(resp => {
+      if (!isScanning()) {
+        return resp;
       }
-      throw resp.error;
-    }).catch(err => { });
+      if (resp && resp.cancel) {
+        return resp;
+      }
+      if (!resp || !resp.result) {
+        __notifyImageScanFailure(resp);
+        return resp;
+      }
+      __result(resp.result);
+      return resp;
+    })
+  ).catch(err => {
+    if (err && err.cancel) {
+      return;
+    }
+    __notifyImageScanFailure(err);
   }).finally(() => {
     __closed();
   });
@@ -512,19 +730,30 @@ export function scanImage() {
 export const supportList = [
   {
     name: "bridge",
-    support: !!inRuntime()
+    get support() {
+      return !!inRuntime();
+    }
   },
   {
     name: "wx",
-    support: !!isSupportWxScan()
+    get support() {
+      return !!isSupportWxScan();
+    }
   },
   {
     name: "web",
-    support: !!isSupportWebScan()
+    get support() {
+      if (shouldSkipWebCameraProbe()) {
+        return false;
+      }
+      return !!canUseWebCameraScan();
+    }
   },
   {
     name: "image",
-    support: !!isSupportImageScan()
+    get support() {
+      return !!isSupportImageScan();
+    }
   },
   {
     name: "scanner",
diff --git a/src/services/web/index.js b/src/services/web/index.js
index 85c7eaf..4f17d42 100644
--- a/src/services/web/index.js
+++ b/src/services/web/index.js
@@ -1,19 +1,31 @@
+import '../../polyfill';
 import { BarcodeDetector as BarcodeDetectorPonyfill, prepareZXingModule } from "barcode-detector/dist/cjs/ponyfill.js";
 import { createUUID } from "../../utils/uuid";
 import { getConfig } from "../config";
+import { inRuntime } from "../bridge";
+import { isWxEnv, isSupportWxScan } from "../wx";
+import { printWarn, printDebug } from "../../utils/logger";
 import scanBeepAudio from "../../../res/scan_beep.ogg";
 
 const scanWeb = {
   uuid: null,
   finish: true,
   stream: null,
-  videoEl: null
+  videoEl: null,
+  cancelSession: null
 }
 
+let activeImageScanCancel = null;
+let activeChooseImageCancel = null;
+
+const HIDDEN_FILE_INPUT_STYLE = "position:fixed;left:-10000px;top:0;width:1px;height:1px;opacity:0;pointer-events:none;z-index:-1;border:0;padding:0;margin:0;";
+
 const DEFAULT_SCAN_BEEP_AUDIO = scanBeepAudio;
 const ZXING_READER_WASM_PATH = "lib/reader.wasm";
 const WEBSCAN_CLOSE_BUTTON_ID = "__webscan_close_button__";
 const WEBSCAN_PICK_IMAGE_BUTTON_ID = "__webscan_pick_image_button__";
+const WEBSCAN_IMAGE_PICKER_OVERLAY_ID = "__webscan_image_picker_overlay__";
+const WEBSCAN_CAMERA_PERMISSION_OVERLAY_ID = "__webscan_camera_permission_overlay__";
 const WEBSCAN_CLOSE_ICON_SVG = "<svg viewBox=\"0 0 1024 1024\" xmlns=\"http://www.w3.org/2000/svg\" width=\"22\" height=\"22\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M566.97558594 521.09667969L856.8828125 231.18945312c14.63378906-14.63378906 14.63378906-38.75976563 0-53.39355468l-1.58203125-1.58203125c-14.63378906-14.63378906-38.75976563-14.63378906-53.39355469 0L512 466.51660156 222.09277344 176.21386719c-14.63378906-14.63378906-38.75976563-14.63378906-53.39355469 0l-1.58203125 1.58203125c-15.02929688 14.63378906-15.02929688 38.75976563 0 53.39355469l289.90722656 289.90722656L167.1171875 811.00390625c-14.63378906 14.63378906-14.63378906 38.75976563 0 53.39355469l1.58203125 1.58203125c14.63378906 14.63378906 38.75976563 14.63378906 53.39355469 0L512 576.07226563 801.90722656 865.97949219c14.63378906 14.63378906 38.75976563 14.63378906 53.39355469 0l1.58203125-1.58203125c14.63378906-14.63378906 14.63378906-38.75976563 0-53.39355469L566.97558594 521.09667969z\" fill=\"currentColor\"/></svg>";
 const WEBSCAN_PICK_IMAGE_ICON_SVG = "<svg viewBox=\"0 0 1024 1024\" xmlns=\"http://www.w3.org/2000/svg\" width=\"22\" height=\"22\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M896 160H128v704h768zm-704 64h640v423.68L706.08 496l-157.12 157.12L352 358.24l-160 240zm0 576v-86.24l160-240 187.04 280.48L701.92 592 832 747.52V800z\" fill=\"currentColor\"/><path d=\"M672 448a96 96 0 1 0-96-96 96 96 0 0 0 96 96zm0-128a32 32 0 1 1-32 32 32 32 0 0 1 32-32z\" fill=\"currentColor\"/></svg>";
 const WEBSCAN_OVERLAY_BUTTON_SIZE = 40;
@@ -23,9 +35,47 @@ const WEBSCAN_OVERLAY_BUTTON_GAP = 10;
 function getDefaultWebScanOverlayButtonStyle() {
   return "width: " + WEBSCAN_OVERLAY_BUTTON_SIZE + "px; height: " + WEBSCAN_OVERLAY_BUTTON_SIZE + "px; padding: 0; border: 0; border-radius: 50%; background: rgba(0, 0, 0, 0.55); color: #fff; display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 10000;";
 }
-const currentScriptSrc = typeof document !== "undefined"
+let sdkScriptSrc = typeof document !== "undefined"
   && document.currentScript
-  && document.currentScript.src;
+  && document.currentScript.src
+  || "";
+
+/** 在 SDK 入口脚本执行时写入，避免 async/defer 导致 currentScript 为空 */
+export function setSdkScriptSrc(src) {
+  if (src && typeof src === "string") {
+    sdkScriptSrc = src;
+  }
+}
+
+function resolveSdkScriptSrc() {
+  const configured = getConfig("webScanWasmBaseUrl");
+  if (configured && typeof configured === "string") {
+    return configured;
+  }
+  if (sdkScriptSrc) {
+    return sdkScriptSrc;
+  }
+  if (typeof document === "undefined") {
+    return "";
+  }
+  if (document.currentScript && document.currentScript.src) {
+    return document.currentScript.src;
+  }
+  const scripts = document.getElementsByTagName("script");
+  for (let i = scripts.length - 1; i >= 0; i--) {
+    const src = scripts[i].src;
+    if (src && /(?:^|\/)index\.js(?:\?|$)/.test(src)) {
+      return src;
+    }
+  }
+  for (let i = scripts.length - 1; i >= 0; i--) {
+    const src = scripts[i].src;
+    if (src) {
+      return src;
+    }
+  }
+  return "";
+}
 
 let barcodeDetectorPreparePromise = null;
 let scanBeepAudioEl = null;
@@ -40,10 +90,19 @@ const SILENT_BEEP_UNLOCK_AUDIO = "data:audio/wav;base64,UklGRiQAAABXQVZFZm10IBAA
 function removeEl(id, uuid) {
   try {
     let el = document.getElementById(id);
-    if (uuid && el && el.uuid !== uuid) {
+    if (!el) {
       return;
     }
-    document.body.removeChild(el);
+    if (uuid && el.uuid !== uuid) {
+      return;
+    }
+    if (el.remove) {
+      el.remove();
+      return;
+    }
+    if (el.parentNode) {
+      el.parentNode.removeChild(el);
+    }
   } catch (error) {
   }
 }
@@ -71,8 +130,185 @@ function stopMediaStream(stream) {
   }
 }
 
-function stopActiveWebScan() {
+function cancelActiveImageScan() {
+  if (activeImageScanCancel) {
+    const cancel = activeImageScanCancel;
+    activeImageScanCancel = null;
+    cancel();
+  }
+}
+
+function cancelActiveChooseImage() {
+  if (activeChooseImageCancel) {
+    const cancel = activeChooseImageCancel;
+    activeChooseImageCancel = null;
+    cancel();
+  }
+}
+
+function removeImagePickerOverlay() {
+  removeEl(WEBSCAN_IMAGE_PICKER_OVERLAY_ID);
+}
+
+function getWebScanImagePickerMode() {
+  const mode = getConfig("webScanImagePickerMode");
+  if (mode === "auto" || mode === "button") {
+    return mode;
+  }
+  if (isAndroid() || isWechatBrowser()) {
+    return "button";
+  }
+  return "auto";
+}
+
+/** 清理残留选图 input / 轮询，避免全屏透明层拦截点击 */
+let activeCameraPermissionCancel = null;
+
+function removeCameraPermissionOverlay() {
+  if (activeCameraPermissionCancel) {
+    const cancel = activeCameraPermissionCancel;
+    activeCameraPermissionCancel = null;
+    cancel();
+    return;
+  }
+  removeEl(WEBSCAN_CAMERA_PERMISSION_OVERLAY_ID);
+}
+
+function queryCameraPermissionState() {
+  if (typeof navigator === "undefined" || !navigator.permissions || typeof navigator.permissions.query !== "function") {
+    return Promise.resolve(null);
+  }
+  return navigator.permissions.query({ name: "camera" }).then(status => {
+    return status && status.state ? status.state : null;
+  }).catch(() => null);
+}
+
+function shouldTrustCameraPermissionQuery() {
+  // 微信等 WebView 的 Permissions API 常与 getUserMedia 实际行为不一致，仅信任本会话已成功开流
+  return !isWechatBrowser();
+}
+
+/** 是否可跳过说明弹窗（不保证不调起系统授权，仅用于是否展示 SDK 说明层） */
+function isWebCameraPermissionGranted() {
+  if (webCameraPermissionGrantedCache === true) {
+    return Promise.resolve(true);
+  }
+  if (!shouldTrustCameraPermissionQuery() || webCameraPermissionApiMismatch) {
+    return Promise.resolve(false);
+  }
+  return queryCameraPermissionState().then(state => state === "granted");
+}
+
+let webCameraPermissionDialogSkipped = false;
+
+function ensureWebScanCameraPermissionBeforeAccess() {
+  webCameraPermissionDialogSkipped = false;
+  return isWebCameraPermissionGranted().then(granted => {
+    if (granted) {
+      webCameraPermissionDialogSkipped = true;
+      printDebug("web camera permission: trusted granted, skip dialog");
+      return;
+    }
+    return showWebScanCameraPermissionDialog();
+  });
+}
+
+function isCameraAccessDeniedError(err) {
+  if (!err) {
+    return false;
+  }
+  const name = err.name || "";
+  return name === "NotAllowedError" || name === "PermissionDeniedError" || name === "SecurityError";
+}
+
+function markWebCameraPermissionApiMismatch(err) {
+  if (!webCameraPermissionDialogSkipped || !isCameraAccessDeniedError(err)) {
+    return;
+  }
+  webCameraPermissionApiMismatch = true;
+  webCameraPermissionGrantedCache = null;
+  printDebug("web camera permission: API granted but getUserMedia denied, will show dialog next time");
+}
+
+/** 申请摄像头前展示说明，用户确认后再触发系统授权（仅 startScan 流程调用） */
+function showWebScanCameraPermissionDialog() {
+  if (getConfig("webScanCameraPermissionDialogEnabled") === false) {
+    return Promise.resolve();
+  }
+  if (typeof document === "undefined") {
+    return Promise.resolve();
+  }
+  removeCameraPermissionOverlay();
+  return new Promise((resolve, reject) => {
+    const overlay = document.createElement("div");
+    overlay.id = WEBSCAN_CAMERA_PERMISSION_OVERLAY_ID;
+    overlay.style.cssText = "position:fixed;left:0;top:0;right:0;bottom:0;z-index:100001;background:rgba(0,0,0,0.55);display:flex;align-items:center;justify-content:center;padding:20px;box-sizing:border-box;";
+    const panel = document.createElement("div");
+    panel.style.cssText = "width:100%;max-width:300px;background:#fff;border-radius:12px;padding:22px 20px;box-shadow:0 8px 28px rgba(0,0,0,0.22);";
+    const title = document.createElement("h3");
+    title.textContent = getConfig("webScanCameraPermissionTitle") || "需要使用摄像头";
+    title.style.cssText = "margin:0 0 12px;font-size:17px;font-weight:600;color:#222;line-height:1.35;text-align:center;";
+    const message = document.createElement("p");
+    message.textContent = getConfig("webScanCameraPermissionMessage")
+      || "为了扫描条形码或二维码，需要您授权使用摄像头。请点击「继续」后，在系统弹窗中选择「允许」。";
+    message.style.cssText = "margin:0 0 20px;font-size:14px;color:#555;line-height:1.55;text-align:left;";
+    const confirmBtn = document.createElement("button");
+    confirmBtn.type = "button";
+    confirmBtn.textContent = getConfig("webScanCameraPermissionConfirmText") || "继续";
+    confirmBtn.style.cssText = "display:block;width:100%;padding:12px;border:0;background:#1b63f4;color:#fff;border-radius:8px;font-size:16px;line-height:1.4;cursor:pointer;";
+    const cancelBtn = document.createElement("button");
+    cancelBtn.type = "button";
+    cancelBtn.textContent = getConfig("webScanCameraPermissionCancelText") || "取消";
+    cancelBtn.style.cssText = "display:block;width:100%;margin-top:10px;padding:10px;border:0;background:#f0f0f0;border-radius:8px;font-size:15px;color:#666;line-height:1.4;cursor:pointer;";
+    const finish = (fn, value) => {
+      activeCameraPermissionCancel = null;
+      removeEl(WEBSCAN_CAMERA_PERMISSION_OVERLAY_ID);
+      fn(value);
+    };
+    activeCameraPermissionCancel = () => finish(reject, { cancel: 1 });
+    confirmBtn.onclick = event => {
+      event.preventDefault && event.preventDefault();
+      finish(resolve);
+    };
+    cancelBtn.onclick = event => {
+      event.preventDefault && event.preventDefault();
+      finish(reject, { cancel: 1 });
+    };
+    panel.appendChild(title);
+    panel.appendChild(message);
+    panel.appendChild(confirmBtn);
+    panel.appendChild(cancelBtn);
+    overlay.appendChild(panel);
+    document.body.appendChild(overlay);
+  });
+}
+
+export function cleanupWebScanResiduals() {
+  cancelActiveChooseImage();
+  removeCameraPermissionOverlay();
+  removeEl("__webscan_image_input__");
+  removeImagePickerOverlay();
+}
+
+function stopActiveWebScan(options) {
+  options = options || {};
+  if (options.cleanupChooseImage !== false) {
+    cleanupWebScanResiduals();
+  }
+  if (scanWeb.cancelSession) {
+    const cancel = scanWeb.cancelSession;
+    scanWeb.cancelSession = null;
+    if (options.invokeCancel !== false) {
+      cancel();
+    }
+  }
+  if (options.cancelImageScan !== false) {
+    cancelActiveImageScan();
+  }
   scanWeb.uuid = null;
+  if (options.keepScanFinish !== true) {
+    scanWeb.finish = true;
+  }
   stopMediaStream(scanWeb.stream);
   try {
     if (scanWeb.videoEl) {
@@ -114,6 +350,126 @@ function isMobile() {
     && /Android|iPhone|iPad|iPod|Mobile/i.test(navigator.userAgent || "");
 }
 
+function isAndroid() {
+  return typeof navigator !== 'undefined'
+    && /Android/i.test(navigator.userAgent || "");
+}
+
+function isIOS() {
+  return typeof navigator !== 'undefined'
+    && /iPhone|iPad|iPod/i.test(navigator.userAgent || "");
+}
+
+function isWechatBrowser() {
+  return isWxEnv();
+}
+
+let webCameraSupportProbed = null;
+/** 本页已成功 getUserMedia 后为 true，用于跳过说明弹窗 */
+let webCameraPermissionGrantedCache = null;
+/** Permissions API 报 granted 但 getUserMedia 仍失败时置 true，不再信任 API */
+let webCameraPermissionApiMismatch = false;
+
+function hasGetUserMediaSupport() {
+  if (typeof navigator === "undefined") {
+    return false;
+  }
+  if (navigator.mediaDevices && typeof navigator.mediaDevices.getUserMedia === "function") {
+    return true;
+  }
+  const legacy = navigator.getUserMedia
+    || navigator.webkitGetUserMedia
+    || navigator.mozGetUserMedia;
+  return typeof legacy === "function";
+}
+
+function invokeGetUserMedia(constraints) {
+  if (typeof navigator === "undefined") {
+    return Promise.reject(new Error("navigator is not available"));
+  }
+  if (navigator.mediaDevices && typeof navigator.mediaDevices.getUserMedia === "function") {
+    return navigator.mediaDevices.getUserMedia(constraints);
+  }
+  const legacy = navigator.getUserMedia
+    || navigator.webkitGetUserMedia
+    || navigator.mozGetUserMedia;
+  if (typeof legacy === "function") {
+    return new Promise((resolve, reject) => {
+      legacy.call(navigator, constraints, resolve, reject);
+    });
+  }
+  return Promise.reject(new Error("getUserMedia is not supported"));
+}
+
+function getWebScanCameraProbeTimeout() {
+  const timeout = getConfig("webScanCameraProbeTimeout");
+  return typeof timeout === "number" && timeout > 0 ? timeout : 3000;
+}
+
+function resolveWebCameraConfigOverride() {
+  if (getConfig("webScanCameraEnabled") === false || getConfig("webScanCameraInWechat") === false) {
+    return false;
+  }
+  if (getConfig("webScanCameraEnabled") === true || getConfig("webScanCameraInWechat") === true) {
+    return true;
+  }
+  return null;
+}
+
+/** bridge / 微信扫一扫实际可用时跳过 H5 摄像头探测，避免 config 阶段申请权限弹窗 */
+export function shouldSkipWebCameraProbe() {
+  if (inRuntime()) {
+    return true;
+  }
+  return !!isSupportWxScan();
+}
+
+/**
+ * 同步判断是否具备 Web 摄像头扫码条件（不申请权限）。
+ * @deprecated 请用 canUseWebCameraScan；保留兼容，不再调用 getUserMedia
+ */
+export function probeWebCameraScan() {
+  if (shouldSkipWebCameraProbe()) {
+    return Promise.resolve(false);
+  }
+  const supported = canUseWebCameraScan();
+  printDebug("web camera capability (sync):", supported);
+  return Promise.resolve(supported);
+}
+
+export function resetWebCameraSupportProbe() {
+  webCameraSupportProbed = null;
+  webCameraPermissionGrantedCache = null;
+  webCameraPermissionApiMismatch = false;
+  webCameraPermissionDialogSkipped = false;
+}
+
+/** 是否支持 Web 摄像头连续扫码（同步能力判断，不触发权限弹窗） */
+export function canUseWebCameraScan() {
+  if (getConfig("webScanEnabled") === false) {
+    return false;
+  }
+  if (!getBarcodeDetectorClass()) {
+    return false;
+  }
+  const override = resolveWebCameraConfigOverride();
+  if (override === false) {
+    return false;
+  }
+  if (override === true) {
+    return hasGetUserMediaSupport();
+  }
+  if (webCameraSupportProbed !== null) {
+    return webCameraSupportProbed;
+  }
+  return hasGetUserMediaSupport();
+}
+
+/** 安卓 WebView/Chrome 对 display:none 的 video 可能不解码帧，需保持可播放但不可见 */
+function getHiddenVideoStyle() {
+  return "position: fixed; width: 2px; height: 2px; opacity: 0.01; pointer-events: none; z-index: -1; left: 0; top: 0;";
+}
+
 function getBarcodeFormats(scanType) {
   let formats = [];
   if (!scanType) {
@@ -140,27 +496,109 @@ function getBarcodeFormats(scanType) {
   return formats;
 }
 
-function getBarcodeDetectorClass() {
+function resolveBarcodeDetectorClass(forcePonyfill) {
+  if (forcePonyfill || shouldPreferPonyfillBarcodeDetector()) {
+    return BarcodeDetectorPonyfill;
+  }
   if (typeof BarcodeDetector !== 'undefined') {
     return BarcodeDetector;
   }
   return BarcodeDetectorPonyfill;
 }
 
+function getBarcodeDetectorClass() {
+  return resolveBarcodeDetectorClass(false);
+}
+
+function shouldPreferPonyfillBarcodeDetector() {
+  if (getConfig("webScanPreferPonyfill") === true) {
+    return true;
+  }
+  // 微信/部分 WebView 的原生 BarcodeDetector 不完整，getSupportedFormats 常为空
+  if (isWechatBrowser()) {
+    return true;
+  }
+  return false;
+}
+
+function needsWasmPrepare(BarcodeDetectorClass) {
+  return BarcodeDetectorClass === BarcodeDetectorPonyfill && !!prepareZXingModule;
+}
+
+const BARCODE_FORMAT_ALIASES = {
+  qrcode: "qr_code",
+  "qr-code": "qr_code",
+  QRCode: "qr_code",
+  ean13: "ean_13",
+  "ean-13": "ean_13",
+  ean8: "ean_8",
+  code128: "code_128",
+  code39: "code_39",
+  upca: "upc_a",
+  upce: "upc_e",
+  datamatrix: "data_matrix",
+  pdf417: "pdf417"
+};
+
+function normalizeBarcodeFormatName(format) {
+  if (!format || typeof format !== "string") {
+    return format;
+  }
+  if (BARCODE_FORMAT_ALIASES[format]) {
+    return BARCODE_FORMAT_ALIASES[format];
+  }
+  const lower = format.toLowerCase().replace(/-/g, "_");
+  return BARCODE_FORMAT_ALIASES[lower] || lower;
+}
+
+function resolveSupportedBarcodeFormats(requestedFormats, reportedFormats) {
+  const reported = (reportedFormats || []).map(normalizeBarcodeFormatName);
+  const requested = (requestedFormats || []).map(normalizeBarcodeFormatName);
+  const supported = requested.filter(format => reported.indexOf(format) !== -1);
+  if (supported.length) {
+    return supported;
+  }
+  if (requestedFormats && requestedFormats.length) {
+    printWarn(
+      "barcode format filter empty, use configured formats:",
+      requestedFormats,
+      "reported:",
+      reportedFormats
+    );
+    return requestedFormats;
+  }
+  return [];
+}
+
 function getZXingReaderWasmUrl() {
-  if (currentScriptSrc) {
-    return new URL(ZXING_READER_WASM_PATH, currentScriptSrc).href;
+  const configuredWasmUrl = getConfig("webScanWasmUrl");
+  if (configuredWasmUrl && typeof configuredWasmUrl === "string") {
+    return configuredWasmUrl;
+  }
+  const scriptSrc = resolveSdkScriptSrc();
+  if (scriptSrc) {
+    const base = getConfig("webScanWasmBaseUrl") || scriptSrc;
+    return new URL(ZXING_READER_WASM_PATH, base).href;
   }
   return "./" + ZXING_READER_WASM_PATH;
 }
 
-function prepareBarcodeDetector() {
-  const BarcodeDetectorClass = getBarcodeDetectorClass();
-  if (typeof BarcodeDetector !== 'undefined' || !prepareZXingModule) {
+function prepareBarcodeDetectorWithTimeout(options) {
+  return promiseWithTimeout(
+    prepareBarcodeDetector(options),
+    getWebScanPrepareTimeout(),
+    "prepare barcode detector"
+  );
+}
+
+function prepareBarcodeDetector(options) {
+  options = options || {};
+  const BarcodeDetectorClass = resolveBarcodeDetectorClass(options.forcePonyfill);
+  if (!needsWasmPrepare(BarcodeDetectorClass)) {
     return Promise.resolve(BarcodeDetectorClass);
   }
-  if (!barcodeDetectorPreparePromise) {
-    barcodeDetectorPreparePromise = prepareZXingModule({
+  if (!barcodeDetectorPreparePromise || options.forcePonyfill) {
+    const preparePromise = prepareZXingModule({
       fireImmediately: true,
       overrides: {
         locateFile: path => {
@@ -170,27 +608,150 @@ function prepareBarcodeDetector() {
           return path;
         }
       }
-    }).then(() => BarcodeDetectorClass);
+    }).then(() => BarcodeDetectorPonyfill).catch(err => {
+      if (!options.forcePonyfill) {
+        barcodeDetectorPreparePromise = null;
+      }
+      printWarn("prepare barcode detector failed:", err, "wasm:", getZXingReaderWasmUrl());
+      throw err;
+    });
+    if (!options.forcePonyfill) {
+      barcodeDetectorPreparePromise = preparePromise;
+    }
+    return preparePromise;
   }
   return barcodeDetectorPreparePromise;
 }
 
-function createBarcodeDetector(scanType) {
-  return prepareBarcodeDetector().then(BarcodeDetectorClass => {
+/** config 阶段预加载 WASM，避免选图后才首次加载失败 */
+export function prepareWebScanBarcodeDetector() {
+  return prepareBarcodeDetector();
+}
+
+function getWebScanDetectTimeout() {
+  const timeout = getConfig("webScanDetectTimeout");
+  return typeof timeout === "number" && timeout > 0 ? timeout : 15000;
+}
+
+function getWebScanPrepareTimeout() {
+  const timeout = getConfig("webScanPrepareTimeout");
+  return typeof timeout === "number" && timeout > 0 ? timeout : 20000;
+}
+
+function getChooseImageTimeout() {
+  const timeout = getConfig("webScanChooseImageTimeout");
+  return typeof timeout === "number" && timeout > 0 ? timeout : 120000;
+}
+
+function promiseWithTimeout(promise, timeoutMs, label) {
+  return new Promise((resolve, reject) => {
+    let settled = false;
+    const timer = setTimeout(() => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      reject(new Error((label || "operation") + " timeout"));
+    }, timeoutMs);
+    Promise.resolve(promise).then(value => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      clearTimeout(timer);
+      resolve(value);
+    }).catch(err => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      clearTimeout(timer);
+      reject(err);
+    });
+  });
+}
+
+function detectWithTimeout(detector, source, timeoutMs) {
+  timeoutMs = timeoutMs || getWebScanDetectTimeout();
+  return new Promise((resolve, reject) => {
+    let settled = false;
+    const timer = setTimeout(() => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      reject(new Error("barcode detect timeout"));
+    }, timeoutMs);
+    Promise.resolve(detector.detect(source)).then(barcodes => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      clearTimeout(timer);
+      resolve(barcodes);
+    }).catch(err => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      clearTimeout(timer);
+      reject(err);
+    });
+  });
+}
+
+function createImageBarcodeDetector(scanType) {
+  const preferPonyfill = getConfig("webScanImagePreferPonyfill") === true;
+  const avoidNativeOnMobile = isAndroid() || isWechatBrowser();
+  printDebug("image scan: create detector, preferPonyfill:", preferPonyfill, "avoidNative:", avoidNativeOnMobile);
+  if (preferPonyfill || avoidNativeOnMobile) {
+    return createBarcodeDetector(scanType, { forcePonyfill: true }).catch(err => {
+      printWarn("image scan ponyfill unavailable, fallback native:", err);
+      return createBarcodeDetector(scanType, { useNativeFormats: true });
+    });
+  }
+  return createBarcodeDetector(scanType, { useNativeFormats: true });
+}
+
+function createBarcodeDetector(scanType, options) {
+  options = options || {};
+  return prepareBarcodeDetectorWithTimeout(options).then(BarcodeDetectorClass => {
     if (!BarcodeDetectorClass) {
       throw new Error("BarcodeDetector is not supported");
     }
     const formats = getBarcodeFormats(scanType);
+    if (!formats.length) {
+      throw new Error("No supported barcode formats, requested formats: " + formats.join(', '));
+    }
+    const createInstance = resolvedFormats => new BarcodeDetectorClass({ formats: resolvedFormats });
+    if (options.useNativeFormats) {
+      return createInstance(formats);
+    }
     if (BarcodeDetectorClass.getSupportedFormats) {
-      return BarcodeDetectorClass.getSupportedFormats().then(supportedFormats => {
-        const supported = formats.filter(format => supportedFormats.indexOf(format) !== -1);
-        if (!supported.length) {
-          throw new Error("No supported barcode formats");
+      return Promise.resolve(BarcodeDetectorClass.getSupportedFormats()).then(reportedFormats => {
+        if (!reportedFormats || !reportedFormats.length) {
+          // 部分 WebView 原生 getSupportedFormats 为空但 detect 仍可用，不做交集过滤
+          return createInstance(formats);
         }
-        return new BarcodeDetectorClass({ formats: supported });
+        const resolved = resolveSupportedBarcodeFormats(formats, reportedFormats);
+        if (!resolved.length) {
+          if (!options.forcePonyfill && typeof BarcodeDetector !== 'undefined' && BarcodeDetectorClass !== BarcodeDetectorPonyfill) {
+            return createBarcodeDetector(scanType, { forcePonyfill: true });
+          }
+          throw new Error("No supported barcode formats, reported formats: " + reportedFormats.join(', '));
+        }
+        return createInstance(resolved);
+      }).catch(err => {
+        if (!options.forcePonyfill && typeof BarcodeDetector !== 'undefined' && BarcodeDetectorClass !== BarcodeDetectorPonyfill) {
+          return createBarcodeDetector(scanType, { forcePonyfill: true });
+        }
+        if (options.forcePonyfill && typeof BarcodeDetector !== 'undefined') {
+          return createBarcodeDetector(scanType, { useNativeFormats: true });
+        }
+        throw err;
       });
     }
-    return new BarcodeDetectorClass({ formats });
+    return createInstance(formats);
   });
 }
 
@@ -433,11 +994,7 @@ export function unlockScanBeep() {
 }
 
 export function isSupportWebScan() {
-  return typeof navigator !== 'undefined'
-    && navigator.mediaDevices
-    && navigator.mediaDevices.getUserMedia
-    && !!getBarcodeDetectorClass()
-    && getConfig("webScanEnabled") !== false;
+  return canUseWebCameraScan();
 }
 
 export function isSupportImageScan() {
@@ -452,12 +1009,43 @@ export function isWebScanImageFallbackEnabled() {
 
 function getWebScanVideoAccessTimeout() {
   const timeout = getConfig("webScanVideoAccessTimeout");
-  return typeof timeout === "number" && timeout > 0 ? timeout : 10000;
+  if (typeof timeout === "number" && timeout > 0) {
+    return timeout;
+  }
+  return isWechatBrowser() ? 3000 : 10000;
 }
 
 function getWebScanVideoReadyTimeout() {
   const timeout = getConfig("webScanVideoReadyTimeout");
-  return typeof timeout === "number" && timeout > 0 ? timeout : 8000;
+  if (typeof timeout === "number" && timeout > 0) {
+    return timeout;
+  }
+  return isWechatBrowser() ? 3000 : 8000;
+}
+
+function needsDeferredFileRead() {
+  return isAndroid() || isWechatBrowser();
+}
+
+function getDeferredFileReadDelay() {
+  const delay = getConfig("webScanFileReadDelay");
+  if (typeof delay === "number" && delay >= 0) {
+    return delay;
+  }
+  if (isAndroid() || isWechatBrowser()) {
+    return 300;
+  }
+  return 0;
+}
+
+function getFilePollInterval() {
+  const interval = getConfig("webScanFilePollInterval");
+  return typeof interval === "number" && interval > 0 ? interval : 250;
+}
+
+function getMaxDeferredFileReadAttempts() {
+  const max = getConfig("webScanFileReadMaxAttempts");
+  return typeof max === "number" && max > 0 ? max : 8;
 }
 
 function getUserMediaWithTimeout(constraints, timeoutMs) {
@@ -470,7 +1058,7 @@ function getUserMediaWithTimeout(constraints, timeoutMs) {
       settled = true;
       reject(new Error("getUserMedia timeout"));
     }, timeoutMs);
-    navigator.mediaDevices.getUserMedia(constraints).then(stream => {
+    invokeGetUserMedia(constraints).then(stream => {
       if (settled) {
         stopMediaStream(stream);
         return;
@@ -489,32 +1077,62 @@ function getUserMediaWithTimeout(constraints, timeoutMs) {
   });
 }
 
-function runWebScanImageFallback(onResult, resolve, reject) {
-  stopActiveWebScan();
-  unlockScanBeep();
-  return createBarcodeDetector(getConfig("webScanType")).then(detector => {
-    return chooseImageFile({ preferCapture: isMobile() }).then(file => {
-      if (!file) {
-        return Promise.reject({ cancel: 1 });
-      }
+function notifyImageScanError(onError, error) {
+  if (!onError || error == null || error === "") {
+    return;
+  }
+  if (typeof error === "string") {
+    onError(error);
+    return;
+  }
+  onError(error.error || error.message || String(error));
+}
+
+function pickImageThenDetect(fileOptions) {
+  return chooseImageFile(fileOptions).then(file => {
+    if (!file) {
+      return Promise.reject({ cancel: 1 });
+    }
+    printDebug("pickImageThenDetect: file selected", file.name);
+    return createImageBarcodeDetector(getConfig("webScanType")).then(detector => {
+      printDebug("pickImageThenDetect: detector ready");
       return detectImageFile(detector, file);
-    }).then(code => {
-      if (code && code.rawValue) {
-        if (!onResult || !onResult(code.rawValue)) {
-          return Promise.reject({ cancel: 1 });
-        }
-        scanWeb.finish = true;
-        resolve({
-          result: code.rawValue
-        });
-        return;
-      }
-      return Promise.reject({
-        success: false,
-        error: "未识别到二维码或条形码",
-        imageFallbackUsed: true
-      });
     });
+  });
+}
+
+function runWebScanImageFallback(onResult, onError, resolve, reject) {
+  // 仅停摄像头，不触发 cancelSession（否则选图前 Promise 已被 reject 为 cancel:1）
+  stopActiveWebScan({ invokeCancel: false, cancelImageScan: false, cleanupChooseImage: true, keepScanFinish: true });
+  scanWeb.finish = false;
+  unlockScanBeep();
+  const preferCapture = getConfig("webScanImagePreferCapture") === true && isMobile();
+  printDebug("image fallback: pick image, mode:", getWebScanImagePickerMode());
+  return pickImageThenDetect({ preferCapture: preferCapture }).then(code => {
+    if (code && code.rawValue) {
+      if (!onResult || !onResult(code.rawValue)) {
+        const scanError = {
+          success: false,
+          error: "扫码结果未被监听消费",
+          imageFallbackUsed: true
+        };
+        notifyImageScanError(onError, scanError.error);
+        return Promise.reject(scanError);
+      }
+      scanWeb.uuid = null;
+      scanWeb.finish = true;
+      resolve({
+        result: code.rawValue
+      });
+      return;
+    }
+    const scanError = {
+      success: false,
+      error: "未识别到二维码或条形码",
+      imageFallbackUsed: true
+    };
+    notifyImageScanError(onError, scanError.error);
+    return Promise.reject(scanError);
   }).catch(err => {
     if (err && err.cancel) {
       reject({ cancel: 1, imageFallbackUsed: true });
@@ -524,14 +1142,17 @@ function runWebScanImageFallback(onResult, resolve, reject) {
       reject(Object.assign({ imageFallbackUsed: true }, err));
       return;
     }
-    reject({
+    printWarn("image fallback detect failed:", err);
+    const scanError = {
       imageFallbackUsed: true,
-      error: err && err.error ? err.error : err
-    });
+      error: err && err.error ? err.error : (err && err.message ? err.message : err)
+    };
+    notifyImageScanError(onError, scanError.error);
+    reject(scanError);
   });
 }
 
-function tryWebScanImageFallback(onResult, resolve, reject, state) {
+function tryWebScanImageFallback(onResult, onError, resolve, reject, state) {
   if (!isWebScanImageFallbackEnabled()) {
     return false;
   }
@@ -541,7 +1162,7 @@ function tryWebScanImageFallback(onResult, resolve, reject, state) {
   if (state) {
     state.imageFallbackStarted = true;
   }
-  runWebScanImageFallback(onResult, resolve, reject);
+  runWebScanImageFallback(onResult, onError, resolve, reject);
   return true;
 }
 
@@ -551,58 +1172,334 @@ export function stopScanForWeb() {
   })
 }
 
-function chooseImageFile(options) {
+function bindChooseImageInput(input, resolve, options) {
+  options = options || {};
+  const autoOpen = options.autoOpen === true;
+  let finished = false;
+  let pickerOpenedAt = 0;
+  let pollTimer = null;
+  let chooseTimer = null;
+  let deferredReadTimer = null;
+  let deferredReadAttempts = 0;
+  const detachInput = () => {
+    try {
+      if (input.remove) {
+        input.remove();
+      } else if (input.parentNode) {
+        input.parentNode.removeChild(input);
+      }
+    } catch (_e) { }
+    removeEl("__webscan_image_input__");
+  };
+  const cleanup = () => {
+    window.removeEventListener("focus", onWindowFocus);
+    document.removeEventListener("visibilitychange", onVisibilityChange);
+    if (pollTimer) {
+      clearInterval(pollTimer);
+      pollTimer = null;
+    }
+    if (chooseTimer) {
+      clearTimeout(chooseTimer);
+      chooseTimer = null;
+    }
+    if (deferredReadTimer) {
+      clearTimeout(deferredReadTimer);
+      deferredReadTimer = null;
+    }
+    activeChooseImageCancel = null;
+    removeImagePickerOverlay();
+    detachInput();
+  };
+  const finish = file => {
+    if (finished) {
+      return;
+    }
+    finished = true;
+    cleanup();
+    printDebug("chooseImageFile:", file ? (file.name + " " + file.size) : "cancelled");
+    resolve(file);
+  };
+  activeChooseImageCancel = () => finish(null);
+  const tryReadFile = source => {
+    if (finished) {
+      return true;
+    }
+    const file = input.files && input.files[0];
+    if (file) {
+      printDebug("chooseImageFile: got file via", source || "unknown");
+      finish(file);
+      return true;
+    }
+    return false;
+  };
+  const scheduleDeferredRead = source => {
+    if (finished) {
+      return;
+    }
+    if (deferredReadTimer) {
+      clearTimeout(deferredReadTimer);
+    }
+    deferredReadTimer = setTimeout(() => {
+      deferredReadTimer = null;
+      if (tryReadFile(source)) {
+        return;
+      }
+      if (!needsDeferredFileRead()) {
+        if (source === "change" || source === "input") {
+          finish(null);
+        }
+        return;
+      }
+      if (deferredReadAttempts < getMaxDeferredFileReadAttempts()) {
+        deferredReadAttempts += 1;
+        scheduleDeferredRead(source);
+      }
+    }, getDeferredFileReadDelay());
+  };
+  const handleChange = () => {
+    unlockScanBeep();
+    if (autoOpen && Date.now() - pickerOpenedAt < 400) {
+      return;
+    }
+    deferredReadAttempts = 0;
+    if (tryReadFile("change")) {
+      return;
+    }
+    if (!needsDeferredFileRead()) {
+      finish(null);
+      return;
+    }
+    scheduleDeferredRead("change");
+  };
+  const onWindowFocus = () => {
+    if (finished || !pickerOpenedAt) {
+      return;
+    }
+    deferredReadAttempts = 0;
+    scheduleDeferredRead("focus");
+  };
+  const onVisibilityChange = () => {
+    if (finished || document.visibilityState !== "visible") {
+      return;
+    }
+    deferredReadAttempts = 0;
+    scheduleDeferredRead("visibility");
+  };
+  input.id = "__webscan_image_input__";
+  input.addEventListener("change", handleChange);
+  if (!isAndroid() && !isWechatBrowser()) {
+    input.addEventListener("input", handleChange);
+  }
+  input.oncancel = () => {
+    finish(null);
+  };
+  pickerOpenedAt = Date.now();
+  window.addEventListener("focus", onWindowFocus);
+  document.addEventListener("visibilitychange", onVisibilityChange);
+  pollTimer = setInterval(() => {
+    if (finished) {
+      return;
+    }
+    tryReadFile("poll");
+  }, getFilePollInterval());
+  chooseTimer = setTimeout(() => {
+    if (!finished) {
+      printWarn("chooseImageFile: timeout");
+      finish(null);
+    }
+  }, getChooseImageTimeout());
+  if (autoOpen) {
+    printDebug("chooseImageFile: opening picker (auto)");
+    try {
+      if (typeof input.showPicker === "function" && !isAndroid()) {
+        input.showPicker();
+      } else {
+        input.click();
+      }
+    } catch (e) {
+      printWarn("chooseImageFile: open picker failed:", e);
+      try {
+        input.click();
+      } catch (e2) {
+        finish(null);
+      }
+    }
+    input.style.cssText = HIDDEN_FILE_INPUT_STYLE;
+  } else {
+    printDebug("chooseImageFile: tap the button to pick image");
+  }
+}
+
+function chooseImageFileAuto(options) {
   options = options || {};
   return new Promise(resolve => {
+    cleanupWebScanResiduals();
     const input = document.createElement("input");
     input.type = "file";
     input.accept = "image/*";
+    input.multiple = false;
     if (options.preferCapture) {
       input.setAttribute("capture", options.captureMode || "environment");
     }
-    input.style.display = "none";
-    let finished = false;
-    let finish = file => {
-      if (finished) {
-        return;
-      }
-      finished = true;
-      removeEl("__webscan_image_input__");
-      resolve(file);
-    };
-    input.id = "__webscan_image_input__";
-    input.onchange = () => {
-      unlockScanBeep();
-      finish(input.files && input.files[0]);
-    };
-    input.oncancel = () => {
-      finish(null);
-    };
+    input.style.cssText = HIDDEN_FILE_INPUT_STYLE;
     document.body.appendChild(input);
-    input.click();
+    bindChooseImageInput(input, resolve, { autoOpen: true });
   });
 }
 
-function detectImageFile(detector, file) {
+function chooseImageFileWithButton(options) {
+  options = options || {};
+  return new Promise(resolve => {
+    cleanupWebScanResiduals();
+    const overlay = document.createElement("div");
+    overlay.id = WEBSCAN_IMAGE_PICKER_OVERLAY_ID;
+    overlay.style.cssText = "position:fixed;left:0;top:0;right:0;bottom:0;z-index:100000;background:rgba(0,0,0,0.5);display:flex;align-items:center;justify-content:center;padding:16px;box-sizing:border-box;";
+    const panel = document.createElement("div");
+    panel.style.cssText = "width:100%;max-width:280px;background:#fff;border-radius:12px;padding:20px;text-align:center;box-shadow:0 8px 24px rgba(0,0,0,0.2);";
+    const title = document.createElement("p");
+    title.textContent = getConfig("webScanImagePickerTitle") || "请选择图片识别";
+    title.style.cssText = "margin:0 0 16px;font-size:16px;color:#333;line-height:1.4;";
+    const label = document.createElement("label");
+    label.style.cssText = "display:block;position:relative;padding:12px 20px;background:#1b63f4;color:#fff;border-radius:8px;font-size:16px;line-height:1.4;cursor:pointer;";
+    const input = document.createElement("input");
+    input.type = "file";
+    input.accept = "image/*";
+    input.multiple = false;
+    if (options.preferCapture) {
+      input.setAttribute("capture", options.captureMode || "environment");
+    }
+    input.style.cssText = "position:absolute;left:0;top:0;width:100%;height:100%;opacity:0;cursor:pointer;font-size:0;";
+    const labelText = document.createElement("span");
+    labelText.textContent = getConfig("webScanImagePickerButtonText") || "选择图片";
+    const cancelBtn = document.createElement("button");
+    cancelBtn.type = "button";
+    cancelBtn.textContent = getConfig("webScanImagePickerCancelText") || "取消";
+    cancelBtn.style.cssText = "display:block;width:100%;margin-top:12px;padding:10px;border:0;background:#f0f0f0;border-radius:8px;font-size:15px;color:#666;cursor:pointer;";
+    cancelBtn.onclick = event => {
+      event.preventDefault && event.preventDefault();
+      if (activeChooseImageCancel) {
+        activeChooseImageCancel();
+      }
+    };
+    label.appendChild(input);
+    label.appendChild(labelText);
+    panel.appendChild(title);
+    panel.appendChild(label);
+    panel.appendChild(cancelBtn);
+    overlay.appendChild(panel);
+    document.body.appendChild(overlay);
+    bindChooseImageInput(input, resolve, { autoOpen: false });
+  });
+}
+
+function chooseImageFile(options) {
+  options = options || {};
+  if (options.mode === "auto") {
+    return chooseImageFileAuto(options);
+  }
+  if (options.mode === "button") {
+    return chooseImageFileWithButton(options);
+  }
+  if (getWebScanImagePickerMode() === "button") {
+    return chooseImageFileWithButton(options);
+  }
+  return chooseImageFileAuto(options);
+}
+
+/** 业务侧已有 File/Blob 时直接识别（绕过 WebView input.files 异常） */
+export function detectImageFileForScan(file) {
   if (!file) {
-    return Promise.resolve(null);
-  }
-  if (typeof createImageBitmap !== 'undefined') {
-    return createImageBitmap(file).then(image => {
-      return detector.detect(image).then(barcodes => {
-        image.close && image.close();
-        return barcodes && barcodes[0];
-      }).catch(err => {
-        image.close && image.close();
-        throw err;
-      });
-    });
+    return Promise.resolve({ cancel: 1 });
   }
+  return createImageBarcodeDetector(getConfig("webScanType")).then(detector => {
+    return detectImageFile(detector, file);
+  }).then(code => {
+    if (code && code.rawValue) {
+      return { result: code.rawValue };
+    }
+    return {
+      success: false,
+      error: "未识别到二维码或条形码"
+    };
+  }).catch(err => {
+    if (err && err.cancel) {
+      return err;
+    }
+    return {
+      success: false,
+      error: err && err.message ? err.message : (err || "图片识别失败")
+    };
+  });
+}
+
+function detectWithCanvas(detector, file) {
   return new Promise((resolve, reject) => {
     const image = new Image();
     const url = URL.createObjectURL(file);
+    let loaded = false;
+    const loadTimer = setTimeout(() => {
+      if (loaded) {
+        return;
+      }
+      URL.revokeObjectURL(url);
+      reject(new Error("image load timeout"));
+    }, getWebScanDetectTimeout());
     image.onload = () => {
-      detector.detect(image).then(barcodes => {
+      loaded = true;
+      clearTimeout(loadTimer);
+      try {
+        const canvas = document.createElement("canvas");
+        let width = image.naturalWidth || image.width;
+        let height = image.naturalHeight || image.height;
+        const maxSide = 2048;
+        if (width > maxSide || height > maxSide) {
+          const scale = maxSide / Math.max(width, height);
+          width = Math.round(width * scale);
+          height = Math.round(height * scale);
+        }
+        canvas.width = Math.max(1, width);
+        canvas.height = Math.max(1, height);
+        const ctx = canvas.getContext("2d");
+        if (!ctx) {
+          URL.revokeObjectURL(url);
+          reject(new Error("canvas context unavailable"));
+          return;
+        }
+        ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
+        URL.revokeObjectURL(url);
+        detectWithTimeout(detector, canvas).then(barcodes => {
+          resolve(barcodes && barcodes[0]);
+        }).catch(reject);
+      } catch (e) {
+        URL.revokeObjectURL(url);
+        reject(e);
+      }
+    };
+    image.onerror = err => {
+      clearTimeout(loadTimer);
+      URL.revokeObjectURL(url);
+      reject(err);
+    };
+    image.src = url;
+  });
+}
+
+function detectWithImageElement(detector, file) {
+  return new Promise((resolve, reject) => {
+    const image = new Image();
+    const url = URL.createObjectURL(file);
+    let loaded = false;
+    const loadTimer = setTimeout(() => {
+      if (loaded) {
+        return;
+      }
+      URL.revokeObjectURL(url);
+      reject(new Error("image load timeout"));
+    }, getWebScanDetectTimeout());
+    image.onload = () => {
+      loaded = true;
+      clearTimeout(loadTimer);
+      detectWithTimeout(detector, image).then(barcodes => {
         URL.revokeObjectURL(url);
         resolve(barcodes && barcodes[0]);
       }).catch(err => {
@@ -611,6 +1508,7 @@ function detectImageFile(detector, file) {
       });
     };
     image.onerror = err => {
+      clearTimeout(loadTimer);
       URL.revokeObjectURL(url);
       reject(err);
     };
@@ -618,41 +1516,110 @@ function detectImageFile(detector, file) {
   });
 }
 
-export function startScanForImage() {
-  return chooseImageFile().then(file => {
-    if (!file) {
-      return null;
-    }
-    return createBarcodeDetector(getConfig("webScanType")).then(detector => {
-      return detectImageFile(detector, file);
+function detectWithImageBitmap(detector, file) {
+  const bitmapOptions = (isAndroid() || isWechatBrowser()) ? { imageOrientation: "from-image" } : undefined;
+  const bitmapPromise = typeof createImageBitmap === "function"
+    ? createImageBitmap(file, bitmapOptions)
+    : Promise.reject(new Error("createImageBitmap unavailable"));
+  return promiseWithTimeout(bitmapPromise, getWebScanDetectTimeout(), "createImageBitmap").then(image => {
+    return detectWithTimeout(detector, image).then(barcodes => {
+      image.close && image.close();
+      return barcodes && barcodes[0];
+    }).catch(err => {
+      image.close && image.close();
+      throw err;
     });
-  }).then(code => {
-    if (code && code.rawValue) {
-      return {
-        result: code.rawValue
-      };
-    }
-    return {
-      success: false,
-      error: "未识别到二维码或条形码"
-    };
   });
 }
 
-export function startScanForWeb(onResult) {
+function detectImageFile(detector, file) {
+  if (!file) {
+    return Promise.resolve(null);
+  }
+  printDebug("detectImageFile:", file.name, file.size);
+  const tryCanvas = () => detectWithCanvas(detector, file);
+  const tryImageElement = () => detectWithImageElement(detector, file);
+  const tryBitmap = () => detectWithImageBitmap(detector, file);
+  const detectTimeout = getWebScanDetectTimeout() + 5000;
+  const run = chain => promiseWithTimeout(chain(), detectTimeout, "image detect");
+  if (isAndroid() || isWechatBrowser() || getConfig("webScanImageDetectPreferCanvas") === true) {
+    return run(() => tryCanvas().catch(() => tryImageElement().catch(tryBitmap)));
+  }
+  if (typeof createImageBitmap === "function") {
+    return run(() => tryBitmap().catch(() => tryCanvas().catch(tryImageElement)));
+  }
+  return run(() => tryCanvas().catch(tryImageElement));
+}
+
+export function startScanForImage() {
+  return new Promise((resolve, reject) => {
+    let settled = false;
+    const finish = (type, value) => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      activeImageScanCancel = null;
+      type(value);
+    };
+    activeImageScanCancel = () => finish(reject, { cancel: 1 });
+    printDebug("startScanForImage: begin, open file picker first");
+    pickImageThenDetect().then(code => {
+      if (settled) {
+        return;
+      }
+      printDebug("startScanForImage: detect done", code && code.rawValue);
+      if (code && code.rawValue) {
+        finish(resolve, {
+          result: code.rawValue
+        });
+        return;
+      }
+      finish(resolve, {
+        success: false,
+        error: "未识别到二维码或条形码"
+      });
+    }).catch(err => {
+      if (settled) {
+        return;
+      }
+      if (err && err.cancel) {
+        finish(resolve, err);
+        return;
+      }
+      printWarn("startScanForImage: failed:", err);
+      finish(resolve, {
+        success: false,
+        error: err && err.message ? err.message : (err || "图片识别失败")
+      });
+    });
+  });
+}
+
+export function startScanForWeb(onResult, onError) {
   let currentUuid = null;
   const fallbackState = { imageFallbackStarted: false };
   return new Promise((resolve, reject) => {
+    let settled = false;
+    const settle = (type, value) => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      scanWeb.cancelSession = null;
+      type(value);
+    };
     try {
       stopActiveWebScan();
       scanWeb.uuid = createUUID();
       scanWeb.finish = false;
       currentUuid = scanWeb.uuid;
+      scanWeb.cancelSession = () => settle(reject, { cancel: 1 });
       let canvasStyle = getConfig("webScanCanvasStyle");
       let canvasClass = getConfig("webScanCanvasClass");
       let videoEl = createEl("video",
         "__webscan_video__",
-        "display: none", false);
+        getHiddenVideoStyle(), false);
       let canvasEnabled = getConfig("webScanCanvasEnabled") !== false;
       let canvasDisplay = "";
       let useDefaultCanvasLayout = !canvasStyle && !canvasClass;
@@ -700,22 +1667,34 @@ export function startScanForWeb(onResult) {
       videoEl.uuid = scanWeb.uuid;
       canvasEl.uuid = scanWeb.uuid;
       createBarcodeDetector(getConfig("webScanType")).then(detector => {
-        return getUserMediaWithTimeout({
-          video: {
-            facingMode: "environment"
+        return ensureWebScanCameraPermissionBeforeAccess().then(() => {
+          return getUserMediaWithTimeout({
+            video: {
+              facingMode: "environment"
+            }
+          }, getWebScanVideoAccessTimeout()).then(stream => {
+            webCameraSupportProbed = true;
+            webCameraPermissionGrantedCache = true;
+            printDebug("web camera access: granted");
+            return {
+              detector,
+              stream
+            };
+          });
+        }).catch(err => {
+          if (!(err && err.cancel)) {
+            webCameraSupportProbed = false;
+            markWebCameraPermissionApiMismatch(err);
+            printDebug("web camera access: denied or failed", err && err.message ? err.message : err);
           }
-        }, getWebScanVideoAccessTimeout()).then(stream => {
-          return {
-            detector,
-            stream
-          };
+          throw err;
         });
       }).then(function (options) {
         const detector = options.detector;
         const stream = options.stream;
         if (scanWeb.uuid !== currentUuid) {
           stopMediaStream(stream);
-          reject({ cancel: 1 });
+          settle(reject, { cancel: 1 });
           return;
         }
         scanWeb.stream = stream;
@@ -723,7 +1702,12 @@ export function startScanForWeb(onResult) {
         const mirrorVideo = shouldMirrorWebVideo(stream);
         const mirrorVideoVertical = shouldMirrorWebVideoVertical();
         videoEl.srcObject = stream;
-        videoEl.setAttribute("playsinline", true); // iOS使用
+        videoEl.setAttribute("playsinline", true);
+        videoEl.setAttribute("webkit-playsinline", true);
+        videoEl.muted = true;
+        if (!videoEl.isConnected) {
+          document.body.appendChild(videoEl);
+        }
         canvasEl.style.display = "none";
         let detecting = false;
         let displayed = false;
@@ -746,7 +1730,7 @@ export function startScanForWeb(onResult) {
             }
             closed = true;
             close();
-            tryWebScanImageFallback(onResult, resolve, reject, fallbackState);
+            tryWebScanImageFallback(onResult, onError, value => settle(resolve, value), value => settle(reject, value), fallbackState);
           }, getWebScanVideoReadyTimeout());
         };
         scheduleVideoReadyTimeout();
@@ -779,7 +1763,7 @@ export function startScanForWeb(onResult) {
               return;
             }
             close();
-            tryWebScanImageFallback(onResult, resolve, reject, fallbackState);
+            tryWebScanImageFallback(onResult, onError, value => settle(resolve, value), value => settle(reject, value), fallbackState);
           });
         }
         if (pickImageButtonEl) {
@@ -795,7 +1779,11 @@ export function startScanForWeb(onResult) {
                 return;
               }
               detectImageFile(detector, file).then(code => {
-                if (!code || !code.rawValue || scanWeb.uuid !== currentUuid || closed) {
+                if (scanWeb.uuid !== currentUuid || closed) {
+                  return;
+                }
+                if (!code || !code.rawValue) {
+                  notifyImageScanError(onError, "未识别到二维码或条形码");
                   return;
                 }
                 if (!onResult || !onResult(code.rawValue)) {
@@ -804,17 +1792,20 @@ export function startScanForWeb(onResult) {
                 scanWeb.uuid = null;
                 scanWeb.finish = true;
                 close();
-                resolve({
+                settle(resolve, {
                   result: code.rawValue
                 });
-              }).catch(() => {
+              }).catch(err => {
+                notifyImageScanError(onError, err);
               });
             });
           };
         }
         let tick = () => {
           try {
-            if (videoEl.readyState === videoEl.HAVE_ENOUGH_DATA && !detecting) {
+            const minReadyState = videoEl.HAVE_CURRENT_DATA || 2;
+            const videoReady = videoEl.readyState >= minReadyState && videoEl.videoWidth > 0;
+            if (videoReady && !detecting) {
               clearVideoReadyTimer();
               canvasEl.width = canvasDisplaySize.width;
               canvasEl.height = canvasDisplaySize.height;
@@ -841,7 +1832,7 @@ export function startScanForWeb(onResult) {
                 }
               }
               detecting = true;
-              detector.detect(videoEl).then(barcodes => {
+              detectWithTimeout(detector, videoEl).then(barcodes => {
                 const code = barcodes && barcodes[0];
                 if (code && code.rawValue && scanWeb.uuid == currentUuid) {
                   if (!onResult || !onResult(code.rawValue)) {
@@ -851,7 +1842,7 @@ export function startScanForWeb(onResult) {
                   scanWeb.uuid = null;
                   scanWeb.finish = true;
                   close();
-                  resolve({
+                  settle(resolve, {
                     result: code.rawValue
                   })
                 }
@@ -868,11 +1859,11 @@ export function startScanForWeb(onResult) {
               tick()
             });
           } else {
-            if (!scanWeb.finish) {
-              reject({ cancel: 1 });
+            close();
+            if (!scanWeb.finish && !fallbackState.imageFallbackStarted) {
+              settle(reject, { cancel: 1 });
               scanWeb.finish = true;
             }
-            close();
           }
           if (scanWeb.finish) {
             close();
@@ -882,14 +1873,16 @@ export function startScanForWeb(onResult) {
           tick();
         });
       }).catch(err => {
-        if (!tryWebScanImageFallback(onResult, resolve, reject, fallbackState)) {
-          reject({ error: err });
+        if (!tryWebScanImageFallback(onResult, onError, value => settle(resolve, value), value => settle(reject, value), fallbackState)) {
+          settle(reject, { error: err });
         }
       });
     } catch (e) {
-      reject({ error: e });
+      settle(reject, { error: e });
     }
   }).finally(() => {
+    scanWeb.cancelSession = null;
+    cleanupWebScanResiduals();
     removeEl("__webscan_video__", currentUuid);
     removeEl("__webscan_canvas__", currentUuid);
     removeEl(WEBSCAN_CLOSE_BUTTON_ID, currentUuid);
diff --git a/types/index.d.ts b/types/index.d.ts
index 560ca55..a5b6f3e 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -45,6 +45,58 @@ interface ScanConfigOptions {
   * 2. 结束扫码的方法名称为：stopScan
   */
   bridgeName?: string,
+  /**
+   * 桥接扫码超时（毫秒），超时后回退 Web/图片识别，默认 5000
+   */
+  bridgeScanTimeout?: number,
+  /**
+   * 是否允许 H5 摄像头扫码：true 强制开启（仍需有媒体 API），false 强制关闭
+   */
+  webScanCameraEnabled?: boolean,
+  /**
+   * @deprecated 请用 webScanCameraEnabled；保留兼容
+   */
+  webScanCameraInWechat?: boolean,
+  /**
+   * @deprecated 摄像头权限已后置到 startScan，请用 webScanVideoAccessTimeout
+   */
+  webScanCameraProbeTimeout?: number,
+  /**
+   * startScan 走 Web 摄像头前是否展示权限说明弹窗，默认 true
+   */
+  webScanCameraPermissionDialogEnabled?: boolean,
+  /**
+   * 摄像头权限说明弹窗标题
+   */
+  webScanCameraPermissionTitle?: string,
+  /**
+   * 摄像头权限说明弹窗正文
+   */
+  webScanCameraPermissionMessage?: string,
+  /**
+   * 摄像头权限说明弹窗确认按钮文案
+   */
+  webScanCameraPermissionConfirmText?: string,
+  /**
+   * 摄像头权限说明弹窗取消按钮文案
+   */
+  webScanCameraPermissionCancelText?: string,
+  /**
+   * 选图后延迟读取 file 对象（毫秒），微信/安卓 WebView 默认 100
+   */
+  webScanFileReadDelay?: number,
+  /**
+   * 强制使用 WASM ponyfill 识别（微信/部分 WebView 建议开启，默认微信内自动开启）
+   */
+  webScanPreferPonyfill?: boolean,
+  /**
+   * WASM 文件完整 URL；未配置时相对 SDK 脚本地址解析 lib/reader.wasm
+   */
+  webScanWasmUrl?: string,
+  /**
+   * WASM 基准路径（SDK 脚本 URL 或目录）；用于 async/defer 加载时修正 reader.wasm 路径
+   */
+  webScanWasmBaseUrl?: string,
   /**
    * webScan是否启用，默认启用
    */
@@ -101,6 +153,41 @@ interface ScanConfigOptions {
    * 摄像头已打开但长时间无画面时触发图片回退（毫秒），默认 8000
    */
   webScanVideoReadyTimeout?: number,
+  /**
+   * 图片/回退识别时 detect 超时（毫秒），默认 15000
+   */
+  webScanDetectTimeout?: number,
+  /**
+   * 图片识别是否优先使用 ZXing ponyfill（原生 detect 在部分 WebView 可能卡住），默认 true
+   */
+  webScanImagePreferPonyfill?: boolean,
+  /**
+   * 移动端图片回退是否使用 capture 拍照（false 为相册选图，兼容性更好），默认 false
+   */
+  webScanImagePreferCapture?: boolean,
+  /**
+   * 图片识别是否优先 canvas 解码（安卓 WebView 建议开启），默认在安卓/微信内自动开启
+   */
+  webScanImageDetectPreferCanvas?: boolean,
+  /**
+   * ZXing WASM 加载超时（毫秒），默认 20000
+   */
+  webScanPrepareTimeout?: number,
+  /**
+   * 选图等待超时（毫秒），默认 120000
+   */
+  webScanChooseImageTimeout?: number,
+  /**
+   * 选图方式：button=显示「选择图片」按钮（安卓/微信默认，需用户点击）；auto=自动弹出系统选图
+   */
+  webScanImagePickerMode?: 'auto' | 'button',
+  webScanImagePickerTitle?: string,
+  webScanImagePickerButtonText?: string,
+  webScanImagePickerCancelText?: string,
+  /**
+   * 单次扫码会话超时（毫秒），超时后状态恢复 ready，默认 90000
+   */
+  scanSessionTimeout?: number,
   /**
    * 扫码成功提示音地址，默认使用内置提示音；任意识别模式匹配成功时播放
    */
@@ -161,6 +248,16 @@ interface ScanResult {
   key: string
 }
 
+/**
+ * 扫码错误
+ */
+interface ScanErrorInfo {
+  error: string,
+  key: string,
+  source?: string,
+  cancel?: number
+}
+
 /**
  * 监听key
  */
@@ -197,6 +294,22 @@ type ScanStatus = "scanning" | "ready";
  */
 type ScanResultCallback = (result: ScanResult) => any;
 
+/**
+ * 监听扫码错误回调
+ */
+type ScanErrorCallback = (error: ScanErrorInfo) => any;
+
+/**
+ * 扫码错误监听信息
+ */
+interface ScanErrorListenerInfo {
+  key?: string;
+  match?: string;
+  level?: number;
+  listener: ScanErrorCallback;
+  cancel: () => void;
+}
+
 /**
  * 监听状态回调
  */
@@ -227,6 +340,19 @@ interface IScan {
    * @param callback 监听回调，或监听key
    */
   offScanListener(callback: ScanResultCallback | string): void;
+  /**
+   * 添加监听扫码错误（如图片识别失败）
+   * @param callback 错误回调
+   * @param key 监听 key
+   * @param match 可选正则，匹配 error 文本后回调
+   * @param level 优先级
+   */
+  onScanErrorListener(callback: ScanErrorCallback, key: string, match?: string, level?: number): ScanErrorListenerInfo;
+  /**
+   * 取消监听扫码错误
+   * @param callback 监听回调，或监听 key
+   */
+  offScanErrorListener(callback: ScanErrorCallback | string): void;
   /**
    * 获取扫码状态
    * @returns ScanStatus
@@ -240,14 +366,12 @@ interface IScan {
    * 开启扫码
    */
   startScan(): void;
-  /**
-   * 开启视频扫码
-   */
-  scanVideo(): void;
   /**
    * 选择图片进行识别
    */
   scanImage(): void;
+  /** 由业务/原生传入已选图片 File 识别（WebView input.files 异常时使用） */
+  scanImageFromFile(file: File | Blob): void;
   /**
    * 清除全部监听
    */