text: /* 创建TCP服务端来接收网络请求 */
  const net=require('net');
  let server=net.createServer(function(socket){
      socket.on('data',function(data){
          console.log(data.toString())
          socket.write("hello")
      });
      socket.on('end',function(){
          console.log("连接断开")
      });
      socket.write("welcome to my TCP server:\n")
  });
  server.listen(8124,function(){
      console.log('server bound')
  })