支持多种qr码，条形码
mebjas/html5-qrcode: A cross platform HTML5 QR code reader. See end to end implementation at: https://scanapp.org (github.com)
只识别条形码
quaggaJS/example/camera_example.html at master · serratus/quaggaJS (github.com)
同时支持qr码，条形码
推荐，扫描一维，二维
GitHub - zxing/zxing: ZXing ("Zebra Crossing") barcode scanning library for Java, Android
案例
1.识别QR码
2.同时识别QR码、条形码、DM码等