var size = cc.winSize;
        var mainscene = ccs.load("res/Scene.json");
        this.addChild(mainscene.node);
         cc.audioEngine.playMusic("res/uiMusic.mp3",true);
         var startSprite = ccs.load("res/startBtn.json"); 
        _startBtn  = mainscene.node.getChildByName("StartSprite");//node
        _startBtn.runAction(startSprite.action);
        startSprite.action.play("bigStart",true);