About the simple communication function between nodejs socket server and client

var net = require('net');
//模块引入
var listenPort = 8080;//监听端口
var server = net.createServer(function(socket){
 // 创建socket服务端
 console.log('connect: ' +
  socket.remoteAddress + ':' + socket.remotePort);
 socket.setEncoding('binary');
 //接收到数据
 socket.on('data',function(data){
  console.log('client send:' + data);
 });
socket.write('Hello client!\r\n');
 // socket.pipe(socket);
 //数据错误事件
 socket.on('error',function(exception){
  console.log('socket error:' + exception);
  socket.end();
 });
 //客户端关闭事件
 socket.on('close',function(data){
  console.log('client closed!');
   // socket.remoteAddress + ' ' + socket.remotePort);
 });
}).listen(listenPort);
//服务器监听事件
server.on('listening',function(){
 console.log("server listening:" + server.address().port);
});
//服务器错误事件
server.on("error",function(exception){
 console.log("server error:" + exception);
});

var net = require('net');
var port = 8080;
var host = '127.0.0.1';
var client= new net.Socket();
//创建socket客户端
client.setEncoding('binary');
//连接到服务端
client.connect(port,host,function(){
 client.write('hello server');
 //向端口写入数据到达服务端
});
client.on('data',function(data){
 console.log('from server:'+ data);
 //得到服务端返回来的数据
});
client.on('error',function(error){
//错误出现之后关闭连接
 console.log('error:'+error);
 client.destory();
});
client.on('close',function(){
//正常关闭连接
 console.log('Connection closed');
});