版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/angular-qrcode/7.2.0/angular-qrcode.js
- https://cdn.bootcdn.net/ajax/libs/angular-qrcode/7.2.0/angular-qrcode.min.js
- https://cdn.bootcdn.net/ajax/libs/angular-qrcode/7.2.0/angular-qrcode.min.js.map