原生js倒计时效果

 1 <script>
 2 function FreshTime()
 3 {
 4         var endtime=new Date("2015/10/1,12:30:00");//结束时间
 5         var nowtime = new Date();//当前时间
 6         var lefttime= parseInt((endtime.getTime() - nowtime.getTime()) / 1000); 
 7         d=  parseInt(lefttime/(24*60*60));
 8         h=  parseInt(lefttime/(60*60)%24);
 9         m=  parseInt(lefttime/60%60);
10         s=  parseInt(lefttime%60);
11        
12         document.getElementById("LeftTime").innerHTML=d+"天"+h+"小时"+m+"分"+s+"秒";
13         if(lefttime<=0){
14         document.getElementById("LeftTime").innerHTML="团购已结束";
15         clearInterval(sh);
16         }
17 }
18    FreshTime();
19    var sh;
20    sh=setInterval(FreshTime,500) ;
21 </script>