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流程：https://blog.csdn.net/csdnsevenn/article/details/105383127
https://blog.csdn.net/hehe_www2012/article/details/116855457
https://blog.csdn.net/xiaoliangtx/article/details/117162566
原理
https://www.cnblogs.com/maolan/p/6015431.html
简单示例
https://www.freesion.com/article/93501295470/
https://www.bilibili.com/video/BV1WC4y1s7wR
http://www.lmk.limuke.top/2020/04/13/qrcode-demo/
js生成
https://blog.csdn.net/gentlu/article/details/78592571
带源码