as3.0 拖动后看排序是否正确

package com{
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.display.SimpleButton;

    public class ShunXu {

        private var thisMc:MovieClip;
        private var mc:MovieClip;
        private var arrY:Array=[];
        private var startX:Number;
        private var startY:Number;
        private var answerArr:Array=["mc4","mc3","mc2","mc1"];//从上到下影片简介的实例名，正确的排列
        private var pushName:Array;
        private var dragMc:MovieClip;
        private var defineBtn:SimpleButton;
        private var newMc:MovieClip;

        public function ShunXu(_thisMc:MovieClip,_mc:MovieClip,_defineBtn:SimpleButton) {
            mc=_mc;
            thisMc=_thisMc;
            defineBtn=_defineBtn;
            for (var i:uint=0; i<mc.numChildren; i++) {
                newMc=mc.getChildAt(i) as MovieClip;
                arrY.push(newMc.y);
            }
            defineBtn.addEventListener(MouseEvent.CLICK,onDF);
            mc.addEventListener(MouseEvent.MOUSE_DOWN,onDown);
        }

        private function onDown(e:MouseEvent) {
            dragMc=e.target as MovieClip;
            dragMc.startDrag();
            mc.setChildIndex(dragMc,mc.numChildren-1);
            startX=dragMc.x;
            startY=dragMc.y;
            thisMc.addEventListener(MouseEvent.MOUSE_UP,onUp);
        }

        private function onUp(e:MouseEvent) {
            dragMc.stopDrag();
            thisMc.removeEventListener(MouseEvent.MOUSE_UP,onUp);
            for (var i=0; i<mc.numChildren; i++) {
                var newHit:MovieClip=mc.getChildAt(i) as MovieClip;
                if (dragMc.hitTestObject(newHit)&&dragMc.name!=newHit.name) {
                    dragMc.x=newHit.x;
                    dragMc.y=newHit.y;
                    newHit.x=startX;
                    newHit.y=startY;
                    return;
                } else {
                    if (i==mc.numChildren-1) {
                        dragMc.x=startX;
                        dragMc.y=startY;
                    }
                }
            }

        }

        private function onDF(e:MouseEvent) {
            pushName=[];
            for (var j:uint=0; j<answerArr.length; j++) {
                for (var i=0; i<mc.numChildren; i++) {
                    newMc=mc.getChildAt(i) as MovieClip;
                    if (newMc.y==arrY[j]) {
                        pushName.push(newMc.name);
                    }
                }
            }
            for (i=0; i<mc.numChildren; i++) {
                if (pushName[i]==answerArr[i]) {
                    if (i==mc.numChildren-1) {
                        trace("正确");
                    }
                } else {
                    trace("错误");
                    return;
                }
            }

        }
    }

}