android 生成二维码后，如何知道生成的二维码有没有被扫描？请求大神们解答！跪谢！！！
走同样的路，发现不同的人生
Like the WeChat QR code, the web page will reference a js with a polling request. After you scan it, it will request the WeChat database to update the status. Then it will poll and request the status of the QR code, which has been scanned.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Like the WeChat QR code, the web page will reference a js with a polling request. After you scan it, it will request the WeChat database to update the status.
Then it will poll and request the status of the QR code, which has been scanned.