Flex 设置时间倒计时

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"creationComplete="application1_creationCompleteHandler(event)"layout="absolute"><mx:Script><![CDATA[/** * * Flex倒计时 * * */import mx.events.FlexEvent;[Bindable]public var str:String;public var timer:Timer;private var isStop:Boolean=false;protected function application1_creationCompleteHandler(event:FlexEvent):void{// TODO Auto-generated method stubtimer=new Timer(1000);timer.addEventListener(TimerEvent.TIMER, timehandle);}private function startTimer():void{timer.start();}private function stopTimer():void{timer.stop();}private function timeTransform(stattime:int, counter:int):String{var str:String="";var count:int=stattime - counter;var hour:int=Math.floor(count / 3600);var miniter:int=count % 3600 / 60;var second:int=count % 60;str=(hour < 10 ? "0" + hour : hour) + ":" + (miniter < 10 ? "0" + miniter : miniter) + ":" + (second < 10 ? "0" + second : second) + "";if (hour == 0 && miniter == 0 && second == 0){isStop=true;}else{isStop=false;}return str;}private function timehandle(e:TimerEvent):void{var count:int=timer.currentCount;str=timeTransform(30, count);if (isStop){stopTimer();}trace(str);}]]></mx:Script><mx:Label x="65"  y="108"  width="311"  height="62"  fontSize="50"  text="{str}"/><mx:Button x="70"   y="17"   label="开始"   click="startTimer()"/><mx:Button x="174"   y="17"   label="暂停"   click="stopTimer()"/></mx:Application>