socket.io

http://www.2cto.com/kf/201403/285640.html

server.js

var io = require('socket.io').listen(8080);
io.set('log level', 1);
var users = {};
io.sockets.on('connection', function (socket) {
  io.sockets.emit('connect',{hell:'boy'});
 
  socket.on('private message', function (from,to,msg) {
    console.log('I received a private message by ', from, ' say to ',to, msg);
    if(to in users){
        users[to].emit('to'+to,{mess:msg});
    }
  });
  socket.on('new user',function(data){
     if(data in users){
         
     }else{
        var nickname = data;
        users[nickname]= socket;
     }
     console.info(users);
  });
  socket.on('disconnect', function () {
    io.sockets.emit('user disconnected');
  });
});

测试页面index.html

<meta charset="utf-8">
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
    <script src="http://localhost:8080/socket.io/socket.io.js"></script>
    <script>
        $(function(){
            var socket = io.connect('http://localhost:8080');
            socket.on('connect', function (data) {
                console.log(data);  
            });
             $("#send").click(function(e){
                var from = $('#user_name').val(),
                    msg  = $('#message').val(),
                    to   = $('#to').val(),
                 $message_list = $('#message_list');
                 socket.emit('new user',from);
                 socket.emit('private message',from,to,msg);
                 socket.on('to'+from, function (data) {
                    $message_list.append('<li>'+data.from+'说'+data.message+'</li><li>');
                });
             });
        });
    </script>
 
 
    姓名:<input id="user_name" type="text"><br>
    发送给：<input type="text" id="to"><br>
    消息内容:<input type="text" id="message"><button type="button" id="send">发送</button>
    <ul id="message_list">
         
    </ul>
 
 
</li>