fix

src/_core.js

@@ -1,6 +1,6 @@
 import './polyfill';
 import { setConfig, getVersion } from './services/config';
-import { onScanListener, offScanListener, setStatusListener, getStatus, startScan, stopScan, clear } from './services/provider/scan';
+import { onScanListener, offScanListener, setStatusListener, getStatus, startScan, stopScan, scanImage, clear } from './services/provider/scan';
 import { initWxJssdk } from './services/wx';
 import { printDebug } from './utils/logger';
 
@@ -41,5 +41,6 @@ export default Object.assign({}, {
   getStatus,
   startScan,
   stopScan,
+  scanImage,
   clear,
 });

src/index.js

@@ -3,7 +3,7 @@ import _global from './polyfill/_global';
 import { exportSDK } from './_export';
 
 const IScan = exportSDK(core, null, "config", "setStatusListener", "onScanListener",
-  "offScanListener", "stopScan", "startScan", "clear");
+  "offScanListener", "stopScan", "startScan", "scanImage", "clear");
 
 function dispatchIScanReady() {
   _global.__IScanReady__ && _global.__IScanReady__();

src/services/provider/scan.js

@@ -344,4 +344,18 @@ export function startScan() {
     _scan_resolve = null;
     __closed();
   });
+}
+
+export function scanImage() {
+  if (!isSupportImageScan()) {
+    console.log("not support image scanner");
+    return;
+  }
+  startScanForImage().then(resp => {
+    if (resp && resp.result) {
+      __result(resp.result);
+    }
+  }).catch(err => {
+    console.log("scan image error", err);
+  });
 }

src/services/web/index.js

@@ -8,6 +8,9 @@ const scanWeb = {
 }
 
 const DEFAULT_SCAN_BEEP_AUDIO = scanBeepAudio;
+const BARCODE_DETECTOR_POLYFILL_URL = "https://fastly.jsdelivr.net/npm/barcode-detector@3/dist/iife/index.min.js";
+
+let barcodeDetectorPolyfillPromise = null;
 
 function removeEl(id) {
   try {
@@ -63,22 +66,66 @@ function getBarcodeFormats(scanType) {
   return formats;
 }
 
+function getBarcodeDetectorClass() {
+  if (typeof BarcodeDetector !== 'undefined') {
+    return BarcodeDetector;
+  }
+  if (typeof window !== 'undefined'
+    && window.BarcodeDetectionAPI
+    && window.BarcodeDetectionAPI.BarcodeDetector) {
+    return window.BarcodeDetectionAPI.BarcodeDetector;
+  }
+  return null;
+}
+
+function loadBarcodeDetectorPolyfill() {
+  if (getBarcodeDetectorClass()) {
+    return Promise.resolve(getBarcodeDetectorClass());
+  }
+  if (barcodeDetectorPolyfillPromise) {
+    return barcodeDetectorPolyfillPromise;
+  }
+  barcodeDetectorPolyfillPromise = new Promise((resolve, reject) => {
+    if (typeof document === 'undefined') {
+      reject(new Error("BarcodeDetector is not supported"));
+      return;
+    }
+    const scriptUrl = getConfig("webBarcodeDetectorPolyfillUrl") || BARCODE_DETECTOR_POLYFILL_URL;
+    const script = document.createElement("script");
+    script.src = scriptUrl;
+    script.onload = () => {
+      const BarcodeDetectorClass = getBarcodeDetectorClass();
+      if (BarcodeDetectorClass) {
+        resolve(BarcodeDetectorClass);
+      } else {
+        reject(new Error("BarcodeDetector polyfill is not ready"));
+      }
+    };
+    script.onerror = reject;
+    document.head.appendChild(script);
+  }).catch(err => {
+    barcodeDetectorPolyfillPromise = null;
+    throw err;
+  });
+  return barcodeDetectorPolyfillPromise;
+}
+
 function createBarcodeDetector(scanType) {
-  return Promise.resolve().then(() => {
-    if (typeof BarcodeDetector === 'undefined') {
+  return loadBarcodeDetectorPolyfill().then(BarcodeDetectorClass => {
+    if (!BarcodeDetectorClass) {
       throw new Error("BarcodeDetector is not supported");
     }
     const formats = getBarcodeFormats(scanType);
-    if (BarcodeDetector.getSupportedFormats) {
-      return BarcodeDetector.getSupportedFormats().then(supportedFormats => {
+    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 new BarcodeDetector({ formats: supported });
+        return new BarcodeDetectorClass({ formats: supported });
       });
     }
-    return new BarcodeDetector({ formats });
+    return new BarcodeDetectorClass({ formats });
   });
 }
 
@@ -126,12 +173,11 @@ export function isSupportWebScan() {
   return typeof navigator !== 'undefined'
     && navigator.mediaDevices
     && navigator.mediaDevices.getUserMedia
-    && typeof BarcodeDetector !== 'undefined';
+    && !!getBarcodeDetectorClass();
 }
 
 export function isSupportImageScan() {
   return typeof document !== 'undefined'
-    && typeof BarcodeDetector !== 'undefined'
     && typeof URL !== 'undefined'
     && URL.createObjectURL;
 }