const { WebSocketServer }  = require ("ws");

const wss = new WebSocketServer({ port: 8080 });

wss.on('connection', function connection(ws) {
    console.log("客户连接建立成功")

  ws.on('message', function message(data) {

    console.log("收到客户端发送消息");

    console.log(data.toString());

    ws.send('服务器给客户端的消息');
  });

 
});