js实现的倒计时操作

<script src="js/jquery-1.10.2.min.js" type="text/javascript"></script>
<script>
  function lxfEndtime(){
          $(".lxftime").each(function(){
                var lxfday=$(this).attr("lxfday");//用来判断是否显示天数的变量
                var endtime = new Date($(this).attr("endtime")).getTime();//取结束日期(毫秒值)
    
                var nowtime = new Date().getTime();        //今天的日期(毫秒值)
                var youtime = endtime-nowtime;//还有多久(毫秒值)
                var seconds = youtime/1000;
                var minutes = Math.floor(seconds/60);
                var hours = Math.floor(minutes/60);
                var days = Math.floor(hours/24);
                var CDay= days ;
                var CHour= hours % 24;
                var CMinute= minutes % 60;
                var CSecond= Math.floor(seconds%60);//"%"是取余运算,可以理解为60进一后取余数,然后只要余数。
                if(endtime<=nowtime){
                        $(this).html("已过期")//如果结束日期小于当前日期就提示过期啦
                        }else{
                                if($(this).attr("lxfday")=="no"){
                                        $(this).html("<i>剩余时间:</i><span>"+CHour+"</span>时<span>"+CMinute+"</span>分<span>"+CSecond+"</span>秒");          //输出没有天数的数据
                                        }else{
                        $(this).html("<i>剩余时间:</i><span>"+days+"</span><em>天</em><span>"+CHour+"</span><em>时</em><span>"+CMinute+"</span><em>分</em><span>"+CSecond+"</span><em>秒</em>");          //输出有天数的数据
                                }
                        }
          });
   setTimeout("lxfEndtime()",1000);
  };
$(function(){
      lxfEndtime();
   });
</script>

<body>
<div class="haveday">
<h1>含有天数的倒计时</h1>
<!--
<div class="lxftime" endtime="11/15/2011 17:24:0"></div>
-->
<div class="lxftime" endtime="05/24/2014 17:24:0"></div>
<div class="lxftime" endtime="11/8/2011 3:3:20"></div>
<div class="lxftime" endtime="7/1/2014 6:1:0"></div>
<div class="lxftime" endtime="04/16/2015 11:3:5"></div>
</div>
<p></p>
<div class="haveday">
<h1>没有天数的倒计时</h1>
<div class="lxftime" endtime="11/15/2011 17:24:0" lxfday="no"></div>
<div class="lxftime" endtime="11/8/2011 3:3:20" lxfday="no"></div>
<div class="lxftime" endtime="9/6/2015 6:1:0" lxfday="no"></div>
<div class="lxftime" endtime="6/6/2016 9:3:5" lxfday="no"></div>
</div>
</body>

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