node需要安装webSocket模块出现的错误

我根据这篇博客https://blog.csdn.net/u014535295/article/details/99303890安装，执行npm install ws -g时，提示如下警告，

npm WARN [email protected] requires a peer of bufferutil@^4.0.1 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of utf-8-validate@^5.0.2 but none is installed. You must install peer dependencies yourself

找了很多资料都没有解决，

继续往下输命令行：node websocket-relay.js supersecret 8081 8082，发现出现Cannot find module 'ws'，意味着服务没有成功设置推送端口（8081）和web端拉流端口（8082），

后面尝试npm install ws，不要-g，虽然也出现了如下警告

继续执行node websocket-relay.js supersecret 8081 8082语句，便可出现

综上所述，npm install ws便可执行node安装webSocket模块