chipmunk移除物体失败

Cocos2d-x JavaScript
#1

这么创建，销毁物体为什么不行？
请问应该怎么销毁物体？


        var body = new cp.Body(1,cp.momentForBox(1,20,20));
        body.setPos(cc.p(100,300));
        body = this._space.addBody(body);
        var shape=cp.BoxShape(body,20,20);
        shape.setElasticity(0.5);
        shape.setFriction(0.8);
        this._space.addShape(shape);


        var shapeList = body.shapeList;
        body.removeShape(shapeList); 
        this._space.removeBody(body);