依赖模块

nodejs-websocket

服务端

const ws = require('nodejs-websocket');
console.log('开始建立连接...');
const server = ws.createServer(function(conn) {
  conn.on('text', function(str) {
    console.log('收到的信息为:' + str);
    conn.send(str);
  });
  conn.on('close', function(code, reason) {
    console.log('关闭连接');
  });
  conn.on('error', function(code, reason) {
    console.log('异常关闭');
  });
}).listen(8001);
console.log('WebSocket建立完毕');

客户端

var ws = new WebSocket('ws://localhost:8001');
ws.onopen = function() {
  console.log('open');
  ws.send('hello');
};
ws.onmessage = function(evt) {
  console.log('message:', evt.data)
};
ws.onclose = function(evt) {
  console.log('close');
};