flex 倒计时 Program niche

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()">
    <mx:Style source="skin/yflexskin.css" />
    <mx:Script>
        <![CDATA[
        import flash.events.TimerEvent;
        import flash.events.Event;
        import flash.media.Sound;
        import flash.media.SoundChannel;
        import flash.utils.Timer;
        import mx.controls.Alert;
        import mx.events.ColorPickerEvent;
       
        private var timer:Timer;
        private var h_num:int;
        private var m_num:int;
        private var s_num:int;
        private var sound:Sound;
        private var soundChan:SoundChannel;
       
        [Embed(source="dida.mp3")]
        public var mp3: Class;
       
        private function init():void
        {
            this.timeComplete();
            sound = new mp3() as Sound;
            timer = new Timer(1000, 0);
            timer.addEventListener(TimerEvent.TIMER, onTimer);
        }
       
        private function onTimer(event:TimerEvent):void
        {
            s_num = s_num - 1;
           
            if ((s_num == -1) &&