Flex中Timer用法一例

<?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>