安装：

npm install ws

服务端（nodejs）：

var WebSocketServer = require('ws').Server,wss = new WebSocketServer({ port: 8080 });wss.on('connection', function (ws) {console.log('client connected');ws.on('message', function (message) { console.log(message);});});

客户端：

<script>var ws = new WebSocket("ws://localhost:8080");ws.onopen = function (e) { console.log('Connection to server opened'); sendMessage();}function sendMessage() { ws.send('hello');}</script>