tweenlite的问题

private function elementsLoadedHandler(e:Event):void
        {
            elementContainer=new Sprite();
            var currentItem:uint;
            for (var i:uint=0; i < numberItems; i++)
            {
                var element:Element=new Element(elementModel.elements[currentItem]);
                element.x=xPos;
                element.alpha=.5;
                addChild(element);
                xPos+=130;
                currentItem++;
                elementsArr.push(element);
                if (currentItem >= elementModel.elements.length)
                {
                    currentItem == 0;
                }
            }
            movementTimer=new Timer(_movementSpeed, 0);
            movementTimer.addEventListener(TimerEvent.TIMER, moveItems);
            movementTimer.start();
            layout();
        }

private function moveItems(e:TimerEvent):void
        {
            var alphaVal:Number=.5;
            movementTimer.delay+=25;
            for (var i:uint=0; i < elementsArr.length; i++)
            {
                xPos=elementsArr[i].x + 130;
                TweenLite.to(elementsArr[i], .5, {x: "130"});
                if (elementsArr[i].x > _width)
                {
                    elementsArr[i].x=0;
                }
            }
        }

numberItems

elementModel.elements