时间倒计时

<script>
var endtime = "{$vo.order_endtime}";
// 倒计时
function CountDown(){
   var end = new Date(endtime);
   var now = new Date();
   var t = end.getTime() - now.getTime();
   
   // 订单超时
   if(end < now ){
      document.getElementById('endtime').innerHTML = '剩余时间0';
      return false;
   }
   
   var d=Math.floor(t/1000/60/60/24);
    var h=Math.floor(t/1000/60/60%24);
    var m=Math.floor(t/1000/60%60);
    var s=Math.floor(t/1000%60);
   
   // 格式化
   var str_d = '';
   var str_h = '';
   var str_m = '';
   var str_s = s+'秒';
   if(d>0){
      str_d = d+'天'; 
   }
   if(h>0){
      str_h = h+'小时';    
   }
   if(m>0){
      str_m = m+'分钟';    
   }
   
   // 已经超时
   if(d<0){
      var st = '已超时';
   }else{
      var str = str_d+str_h+str_m+str_s; 
   }
   document.getElementById('endtime').innerHTML = str;
}
//CountDown();
setInterval(CountDown,1000);




</script>