cocos2d-js碰撞停止

[zqw87699]

var HelloWorldLayer = cc.Layer.extend({

linelr:null,
circle2:null,
action2:null,
ctor:function () {
    //////////////////////////////
    // 1. super init first
    this._super();

    var size = cc.winSize;
    
    var layerBackGround = new cc.LayerColor(cc.color(255,255,255,255),size.width,size.height);
    //layer1.ignoreAnchorPointForPosition(false);
    this.addChild(layerBackGround, 0);
    
    this.linelr = new cc.DrawNode();
    this.linelr.drawSegment( cc.p(10,400), cc.p(470, 400), 5, cc.color(40,120,240,100) );
    this.addChild(this.linelr, 10);

    
    this.circle2 = new cc.DrawNode();//灰色的在下方
    this.circle2.retain();
    this.circle2.x=120;
    this.circle2.y=100;
    this.circle2.drawDot( cc.p(this.circle2.x, this.circle2.y), 50, cc.color(0,0,0,100));
    

    this.scheduleOnce(this.move,0);
     this.scheduleUpdate();
    
 
    return true;
},
move : function(){
    
    this.action2 =new cc.MoveBy(3, cc.p(0, 400));
    this.circle2.runAction(this.action2);
    this.addChild(this.circle2, 10);
},

update : function()
{
    var dollRect = this.linelr;  
    var dollHeadRect = this.circle2;  
    if(cc.rectIntersectsRect(dollRect,dollHeadRect))//碰撞检测
    {
        cc.director.getActionManager().removeAction(this.action2);//中止运行
        //cc.director.getActionManager().pauseAllRunningActions();
    }
}

});

var HelloWorldScene = cc.Scene.extend({
onEnter:function () {
this._super();
var layer = new HelloWorldLayer();
this.addChild(layer);
}
});

为什么不碰撞啊