clippernode的bug

@405353624 写道：

    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

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