nothing but a demo for encrypt msg in html, that you can share your secret in wechat and other IM app, use it like this url:
https://robinfoxnan.github.io/codemsg/text.htm
you should share a 'code' which is only known by your peer friend.
good luck!
中文： 在微信中可以使用如下地址访问： https://robinfoxnan.github.io/codemsg/text.htm 或者 https://htmlpreview.github.io/?https://github.com/robinfoxnan/codemsg/main/text.htm?
您需要事先与对端朋友约定一个加解密的字符串，用于对称加解密；