Flex中Timer用法一例：计时器

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white"
creationComplete="init()" viewSourceURL="srcview/index.html">

<mx:Script>
<![CDATA[
import flash.utils.Timer;
import flash.events.TimerEvent;

private const MIN_MASK:String = "00";
private const SEC_MASK:String = "00";
private const MS_MASK:String = "000";
private const TIMER_INTERVAL:int = 10;

private var baseTimer:int;

private var t:Timer;

private function init():void {
t = new Timer(TIMER_INTERVAL);
t.addEventListener(TimerEvent.TIMER, updateTimer);
}

private function updateTimer(evt:TimerEvent):void {
var d:Date = new Date(getTimer() - baseTimer);
var min:String = (MIN_MASK + d.minutes).substr(-MIN_MASK.length);
var sec:String = (SEC_MASK + d.seconds).substr(-SEC_MASK.length);
var ms:String = (MS_MASK + d.milliseconds).substr(-MS_MASK.length);
counter.text = String(min + ":" + sec + "." + ms);
}

private function startTimer():void {
baseTimer = getTimer();
t.start();
}

private function stopTimer():void {
t.stop();
}
]]>
</mx:Script>

<mx:ApplicationControlBar dock="true">
<mx:Button label="Start timer" click="startTimer()" />
<mx:Button label="Stop timer" click="stopTimer()" />
</mx:ApplicationControlBar>

<mx:Label id="counter" fontSize="96" />

</mx:Application>