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,
 });