private var scoutTime:Timer=new Timer(10000000,1);//闹钟计时器

  private function scout() {
   scoutTime.stop();
  
   var curtime:Date=new Date();
  
   var curHour:Number=curtime.getHours();
   var curMinute:Number=curtime.getMinutes();
   var curSecond:Number=curtime.getSeconds();
  
   var desHour:Number=Number(_desHour);
   var desMinute:Number=Number(_desMinute);
   var desSecond:Number=0;
  
   var step:Number;//时间差值－毫秒
  
   if(curSecond>desSecond){
    desSecond+=60;
    desMinute-=1;
   }
   if(curMinute>desMinute){
    desMinute+=60;
    desHour-=1;
   }
   if(curHour>desHour){
    desHour+=24;
   }
  
   step=(desHour-curHour)*60*60*1000+(desMinute-curMinute)*60*1000+(desSecond-curSecond)*1000;
   //trace(step);
  
   scoutTime=new Timer(step,1);
   scoutTime.addEventListener(TimerEvent.TIMER,timeover);
   scoutTime.start();
  }