在onLoad里面调用：
var socket = io('http://localhost:3000');
socket.on('connected', function(msg){
cc.log(msg);
})
会疯狂打印，重复连接
本地的node.js服务器代码:
var app = require(‘express’)();
var http = require(‘http’).Server(app);
var io = require(‘socket.io’)(http);
app.get(’/’, function(req, res){
res.sendFile(__dirname + ‘/index.html’);
});
io.on(‘connection’, function(socket){
console.log(‘a user connected’);
socket.on(‘disconnect’, function(){
console.log(‘user disconnected’);
});
socket.on('chat message', function(msg){
console.log('message: ' + msg);
});
});
http.listen(3000, function(){
console.log(‘listening on *:3000’);
});
