js 促销倒计时

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<div class="p-time fr">距离结束还有:<span class="promote_left" data-time="{$promote.end_date_format}" id="promote_time{$promote.id}">
            <strong>00</strong> 时
            <strong>00</strong> 分
            <strong>00</strong> 秒

          </span></div>

<script type="text/javascript">
var time_html = "";
$(document).ready(function(){
    setInterval("get_left_time()",1000);
});


function  get_left_time()
{
  $(".promote_left").each(function(){
      //left_time: 2016/03/03 06:00:00
      var left_time = $(this).attr("data-time");
      var end_time= new Date(left_time); 
      var now_time = new Date();
      var left_time =end_time.getTime() - now_time.getTime();
      if (left_time < 0)
      {
        left_time = 0;
        dateLeft = 0;
        hourLeft = 0;
        minuteLeft = 0;
        secondLeft = 0;
      }
      else
      {
        dateLeft   = Math.floor(left_time/1000/60/60/24);
        hourLeft   = Math.floor(left_time/1000/60/60%24);
        minuteLeft = Math.floor(left_time/1000/60%60);
        secondLeft = Math.floor(left_time/1000%60);
      }
      if(dateLeft>0)
      {
        time_html = "<strong>"+dateLeft+"</strong> 天"
      }else
      {
        hourLeft   = check_time(hourLeft);
        minuteLeft = check_time(minuteLeft);
        secondLeft = check_time(secondLeft);
        time_html = "<strong>"+hourLeft+"</strong> 时";
        time_html += "<strong>"+minuteLeft+"</strong> 分";
        time_html += "<strong>"+secondLeft+"</strong> 秒";
      }
      $(this).html(time_html);
  });
}


function check_time(i)    
{    
   if (i < 10) {    
       i = "0" + i;    
    }    
   return i;    
}    

</script>

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