滚动条制作

tuodongtiao.addEventListener(MouseEvent.MOUSE_DOWN, _onDrag);
private function _onDrag(e:MouseEvent)
{
	var t:MovieClip = MovieClip(e.target);
	t.startDrag(false, new Rectangle(430, 0, 0, 400));
        t.addEventListener(Event.ENTER_FRAME, _onDragerEnterFrame);
	stage.addEventListener(MouseEvent.MOUSE_UP, _onStopDrag);
}
private function _onStopDrag(e:MouseEvent)
{
	stage.removeEventListener(MouseEvent.MOUSE_UP, _onStopDrag);
	tuodongtiao.stopDrag();
}
private function _onDragerEnterFrame(e:Event)
{
	var t:MovieClip = MovieClip(e.target);
	var delta = t.y * (car.lingdong.ceng.wenziMc.wenzi.textHeight - 380) / 400;
	if (delta > 0)
	{
		car.lingdong.ceng.wenziMc.y = car.lingdong.ceng.wenziMc.originY - delta; 
	}
}