npm install --save express
npm install --save socket.io
服务器端代码：
var app = require(‘express‘)(); var http = require(‘http‘).Server(app); var io = require(‘socket.io‘)(http); app.get(‘/‘, function(req, res){ res.send(‘<h1>Welcome Realtime Server</h1>‘); }); io.on(‘connection‘, function(socket){ console.log(‘a user connected‘); socket.on("disconnect", function() { console.log("a user go out"); }); socket.on("message", function(obj) { io.emit("message", obj); }); }); http.listen(3000, function(){ console.log(‘listening on *:3000‘); });
客户端代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://127.0.0.1:3000/socket.io/socket.io.js"></script>
</head>
<body>
<ul id="message"></ul>
<script>
socket = io.connect(‘ws://127.0.0.1:3000‘);
socket.emit("message", {"name" : navigator.userAgent, "msg" : "hello world"});
socket.on("message", function(obj) {
console.log(obj);
});
</script>
</body>
</html>
原文：http://www.cnblogs.com/white0710/p/7890891.html