第一个nodejs简易聊天室

var net = require('net');var clients = [];function Client(stream) {  this.name = null;  this.stream = stream;}var server = net.createServer(function (stream) {  stream.setEncoding('utf-8');  var address = stream.remoteAddress;  var client = new Client(stream);  if (address === '127.0.0.1') {    client.name = 'system';    clients.push(client);  } else {    stream.write('请在10s内输入您的昵称！\n');  }  var timeout = setTimeout(function () {    if (client.name === null) {      stream.write('对不起，您已经超时！\n');      stream.end();    }  }, 10000);  stream.on('data', function(data) {    if (client.name === null) {      var name = data.match(/\S+/);      name = name[0];      var flag = false;      for (var key in clients) {        if (clients[key].name === name) {          flag = true;          stream.write('对不起，该昵称已被使用，请换个试试！\n');          break;        }      }      if (flag) {        return;      }      client.name = name;      console.log(client.name, '进入聊天室');      stream.write('欢迎您进入聊天室！\n');      clients.forEach(function(c) {        c.stream.write(client.name+' 进入聊天室！\n');      });      clients.push(client);      return;    }    clients.forEach(function(c) {      if (c !== client) {        c.stream.write(client.name+" : "+data);      }    });  });  stream.on('end', function() {    var position = -1;    clients.forEach(function(c, index) {      if (c === client) {        position = index;      }      if (c !== client && client.name !== null) {        c.stream.write(client.name+' 离开了！\n');      }    });    stream.end();    if (position >= 0) {      clients.splice(position, 1);    }  });  stream.on('error', function(err) {    var position = -1;    clients.forEach(function(c, index) {      if (c === client) {        position = index;      }      if (c !== client && client.name !== null) {        c.stream.write(client.name+' 异常退出！\n');      }    });    stream.end();    if (position >= 0) {      clients.splice(position, 1);    }  });});server.listen(8000);