clippernode的bug

Cocos2d-x JavaScript
#1 
        var clipper = new cc.ClippingNode();
        clipper.tag = TAG_CLIPPERNODE;
        clipper.width = 200;
        clipper.height = 200;
        clipper.anchorX = 0.5;
        clipper.anchorY = 0.5;
        clipper.x = this.width / 2;
        clipper.y = this.height / 2;
        clipper.runAction(cc.rotateBy(1, 45).repeatForever());
//A===============================================
        var stencil = new cc.DrawNode();
        var rectangle = [cc.p(0, 0),cc.p(clipper.width, 0),
            cc.p(clipper.width, clipper.height),
            cc.p(0, clipper.height)];

        var white = cc.color(255, 255, 255, 255);
        stencil.drawPoly(rectangle, white, 1, white);
        clipper.stencil = stencil;

//B================================================
        **_this.addChild(clipper);_**

如果把代码this.addChild(clipper);放到A处，运行报错
CCClippingNode.js:94 Uncaught TypeError: Cannot read property 'onEnter' of null，
但是如果放在B处就不会报错

#2

估计是ClippingNode被addChild的时候会调用stencil的onEnter，但是在A处还没设置stencil，所以变成调用null.onEnter()报错。