var net = require('net');var server = net.createServer();//聚合所有客戶端var sockets = [];//接受新的客戶端連接server.on('connection', function(socket){  console.log('got a new connection');  sockets.push(socket);  //從連接中讀取數(shù)據(jù)  socket.on('data', function(data){    console.log('got data:', data);    //廣播數(shù)據(jù)    //每當(dāng)一個(gè)已連接的用戶輸入數(shù)據(jù)，就將這些數(shù)據(jù)廣播給其他所有已連接的用戶    sockets.forEach(function(otherSocket){      if (otherSocket !== socket){        otherSocket.write(data);      }    });    //刪除被關(guān)閉的連接    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，定義三秒后重新連接var retriedTimes = 0;  //記錄重新連接的次數(shù)var maxRetries = 10;  //最多重新連接十次process.stdin.resume(); //process.stdin流來接受用戶的鍵盤輸入，這個(gè)可讀流初始化時(shí)處于暫停狀態(tài)，調(diào)用流上的resume()方法來恢復(fù)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);  }});//連接時(shí)設(shè)置最多連接十次，并且開啟定時(shí)器三秒后再連接(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});})();