Node.js环境WebSocket示例

server.js：

const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 3000 });

wss.on('connection', function connection(ws) {
  console.log('客户端已连接');

  ws.on('message', function incoming(message) {
    console.log('收到客户端消息:', message);
    ws.send(`服务端收到消息: ${message}`);
  });

  ws.on('close', function close() {
    console.log('客户端已断开连接');
  });
});

client.js：

const WebSocket = require('ws');

const clientSocket = new WebSocket('ws://localhost:3000');

clientSocket.on('open', function open() {
  console.log('连接已建立');
  clientSocket.send('Hello, WebSocket Server from Client!');
});

clientSocket.on('message', function incoming(data) {
  console.log('收到服务端消息:', data);
});

clientSocket.on('close', function close() {
  console.log('连接已关闭');
});

这里直接用ws模块提供的WebSocket来充当客户端，如果报错，试着升级下ws包。