318 lines
6.4 KiB
Markdown
318 lines
6.4 KiB
Markdown
# scan-code-jssdk
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统一扫码 JSSDK，支持桥接扫码、微信 JSSDK 扫码、Web 摄像头扫码、选择图片识别和扫码枪输入。
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## 功能
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- App 桥接环境：优先调用原生桥接 `startScan` / `stopScan`。
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- 微信浏览器：初始化微信 JSSDK 后调用 `wx.scanQRCode`。
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- Web 浏览器：使用 `BarcodeDetector` 识别二维码和条形码。
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- 图片识别：选择本地图片后识别二维码/条形码。
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- 扫码枪：监听键盘快速输入并统一走扫码监听回调。
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- 监听规则：支持按 `match` 正则和 `level` 优先级分发扫码结果。
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## 引入
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构建后使用 `dist/index.js`：
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```html
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<script src="./dist/index.js"></script>
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<script>
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IScan.config().then(function () {
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console.log("IScan ready");
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});
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</script>
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```
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如果脚本是后加载的，可以监听 `IScanReady`：
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```js
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function init() {
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IScan.config().then(function () {
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// ready
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});
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}
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if (window.IScan) {
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init();
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} else {
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window.addEventListener("IScanReady", init, { once: true });
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}
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```
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## 快速开始
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```js
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IScan.config({
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webCanvasEnabled: true,
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webScanBeepEnabled: true,
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initWechatJssdk: {
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apiUrl: "https://your-domain.com/wechat/jssdk-config"
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}
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}).then(function () {
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IScan.setStatusListener(function (status) {
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console.log("status:", status);
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});
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IScan.onScanListener(function (res) {
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console.log("scan result:", res.result, res.key);
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}, "scan", null, 100);
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});
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// 自动选择可用扫码方式：桥接 -> 微信 -> Web 摄像头 -> 图片识别
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IScan.startScan();
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// 仅打开 Web 视频扫码
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IScan.scanVideo();
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// 仅选择图片识别
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IScan.scanImage();
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// 停止当前扫码
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IScan.stopScan();
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```
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## 配置项
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通过 `IScan.config(options)` 配置。
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```ts
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interface ScanConfigOptions {
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bridgeEnabled?: boolean;
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bridgeName?: string;
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webCanvasEnabled?: boolean;
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webScanCanvasStyle?: string;
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webScanType?: ("qrCode" | "barCode")[];
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webScanVideoMirror?: boolean;
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webScanVideoMirrorVertical?: boolean;
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webScanBeepAudio?: string;
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webScanBeepEnabled?: boolean;
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initWechatJssdk?: {
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apiUrl: string;
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sdkConfig?: {
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debug?: boolean;
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appId: string;
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timestamp: number;
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nonceStr: string;
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signature: string;
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};
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sdkUrl?: string;
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jsApiList?: string[];
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};
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}
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```
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| 配置 | 说明 | 默认值 |
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| --- | --- | --- |
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| `bridgeEnabled` | 是否启用桥接扫码 | `true` |
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| `bridgeName` | 挂载在 `window` 上的桥接对象名称 | `__bridge_client__` |
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| `webCanvasEnabled` | 是否显示 Web 扫码 canvas；关闭后仍会用隐藏 canvas 识别 | `true` |
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| `webScanCanvasStyle` | Web 扫码 canvas 样式 | `position: fixed; width: 300px; height: 300px; top: 0; left: 0; z-index: 9999;` |
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| `webScanType` | Web 扫码类型 | `["qrCode", "barCode"]` |
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| `webScanVideoMirror` | Web 视频是否水平镜像；不配置时自动判断：前置/PC 镜像，后置不镜像 | 自动 |
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| `webScanVideoMirrorVertical` | Web 视频是否垂直镜像 | `false` |
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| `webScanBeepAudio` | Web 扫码成功提示音地址 | 内置提示音 |
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| `webScanBeepEnabled` | Web 扫码成功是否播放提示音 | `true` |
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| `initWechatJssdk` | 微信 JSSDK 初始化配置，仅微信环境生效 | 无 |
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## 桥接接入
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桥接对象需要挂载到 `window[bridgeName]`，并实现 `call(method, data)`。
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SDK 会调用：
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- `startScan`
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- `stopScan`
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异步回调方法名为 `${bridgeName}_handle_callback`。
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```js
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window.__bridge_client__ = {
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call: function (method, data) {
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var requestId = data.request_id;
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if (method === "startScan") {
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// 调用原生扫码后回调
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window.__bridge_client___handle_callback({
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code: 0,
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method: method,
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request_id: requestId,
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payload: {
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result: "https://example.com"
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}
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});
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}
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if (method === "stopScan") {
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window.__bridge_client___handle_callback({
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code: 0,
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method: method,
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request_id: requestId,
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payload: {}
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});
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}
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}
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};
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```
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## 微信 JSSDK 接入
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配置接口方式：
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```js
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IScan.config({
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initWechatJssdk: {
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apiUrl: "https://your-domain.com/wechat/jssdk-config"
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}
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});
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```
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接口会收到当前页面 URL 参数：`url=location.href.split("#")[0]`。
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也可以直接传入微信签名配置：
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```js
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IScan.config({
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initWechatJssdk: {
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apiUrl: "",
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sdkConfig: {
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appId: "wx_app_id",
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timestamp: 123456,
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nonceStr: "nonce",
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signature: "signature"
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}
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}
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});
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```
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`jsApiList` 会默认追加 `scanQRCode`。
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## API
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### `config(options?): Promise<any>`
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配置并初始化 SDK。
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```js
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IScan.config({
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webCanvasEnabled: true
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});
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```
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### `setStatusListener(callback): void`
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监听扫码状态，状态为：
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- `scanning`
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- `closed`
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```js
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IScan.setStatusListener(function (status) {
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console.log(status);
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});
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```
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### `onScanListener(callback, key, match?, level?): ScanListenerInfo`
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添加扫码结果监听。
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```js
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var listener = IScan.onScanListener(function (res) {
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console.log(res.result, res.key);
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}, "order", "^https://", 100);
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```
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参数说明：
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- `callback`：扫码结果回调。
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- `key`：监听 key，同 key 会覆盖旧监听。
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- `match`：可选正则字符串；扫码结果匹配后才回调。
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- `level`：优先级，数值越大越先匹配。
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### `offScanListener(callbackOrKey): void`
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移除监听，可传 callback 或 key。
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```js
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IScan.offScanListener("order");
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listener.cancel();
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```
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### `getStatus(): "scanning" | "closed"`
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获取当前扫码状态。
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```js
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console.log(IScan.getStatus());
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```
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### `startScan(): void`
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开启扫码。SDK 会按以下顺序选择可用能力：
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1. 桥接扫码
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2. 微信扫码
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3. Web 摄像头扫码
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4. 图片识别
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扫码结果通过 `onScanListener` 回调。
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```js
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IScan.startScan();
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```
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### `scanVideo(): void`
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直接开启 Web 摄像头扫码。扫码结果通过 `onScanListener` 回调。
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```js
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IScan.scanVideo();
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```
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### `scanImage(): void`
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直接选择图片进行识别。识别结果通过 `onScanListener` 回调。
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```js
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IScan.scanImage();
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```
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### `stopScan(): void`
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停止当前扫码。
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```js
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IScan.stopScan();
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```
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### `clear(): void`
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清空全部扫码监听。
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```js
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IScan.clear();
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```
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## 类型
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```ts
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interface ScanResult {
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result: string;
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key: string;
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}
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type ScanStatus = "scanning" | "closed";
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type ScanResultCallback = (result: ScanResult) => any;
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type ScanStatusCallback = (status: ScanStatus) => any;
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```
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## 开发
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```bash
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npm install
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npm run build
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```
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构建产物输出到 `dist` 目录。
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