我的代码，为什么没有反应。。。无语

Cocos2d-x JavaScript
#1

//小车
this.Car = new cc.Sprite(res.Car_png);
this.Car.x = size.width/2;
this.Car.y = size.height/2 - 176;
this.Car.scale = 0.3;
this.addChild(this.Car, 1);

    //触摸事件，只在手机和平板终端上运行时触发
    cc.eventManager.addListener({
        event:cc.EventListener.TOUCH_ONE_BY_ONE,
        onTouchBegan:function(touch,event)
        {
            var pos = touch.getLocation();
            this.Car.x = pos.x;
        },
        onTouchMoved:function(touch,event){},
        onTouchEnded:function(touch,event){},
        onTouchCancelled:function(touch,event){}
    },this);