How to implement chat function using nodejs

var net = require('net'); var server = net.createServer(); //聚合所有客户端 var sockets = []; //接受新的客户端连接 server.on('connection', function(socket){ console.log('got a new connection'); sockets.push(socket); //从连接中读取数据 socket.on('data', function(data){ console.log('got data:', data); //广播数据 //每当一个已连接的用户输入数据，就将这些数据广播给其他所有已连接的用户 sockets.forEach(function(otherSocket){ if (otherSocket !== socket){ otherSocket.write(data); } }); //删除被关闭的连接 socket.on('close', function(){ console.log('connection closed'); var index = sockets.indexOf(socket); sockets.splice(index, 1); }); }); }); server.on('error', function(err){ console.log('Server error:', err.message); }); server.on('close', function(){ console.log('Server closed'); }); server.listen(4000);

var net = require('net'); var port = 4000; var quitting = false; var conn; var retryTimeout = 3000; //三秒，定义三秒后重新连接 var retriedTimes = 0; //记录重新连接的次数 var maxRetries = 10; //最多重新连接十次 process.stdin.resume(); //process.stdin流来接受用户的键盘输入，这个可读流初始化时处于暂停状态，调用流上的resume()方法来恢复流 process.stdin.on('data', function(data){ if (data.toString().trim().toLowerCase() === 'quit'){ quitting = true; console.log('quitting'); conn.end(); process.stdin.pause(); } else { conn.write(data); } }); //连接时设置最多连接十次，并且开启定时器三秒后再连接 (function connect() { function reconnect() { if (retriedTimes >= maxRetries) { throw new Error('Max retries have been exceeded, I give up.'); } retriedTimes +=1; setTimeout(connect, retryTimeout); } conn = net.createConnection(port); conn.on('connect', function() { retriedTimes = 0; console.log('connect to server'); }); conn.on('error', function(err) { console.log('Error in connection:', err); }); conn.on('close', function() { if(! quitting) { console.log('connection got closed, will try to reconnect'); reconnect(); } }); //打印 conn.pipe(process.stdout, {end: false}); })();