js实现商品团购活动到计时

/*倒计时*/

function lxfEndtime(){

 $(".lxftime").each(function(){

  var lxfday=$(this).attr("lxfday");

  var endtime = new Date($(this).attr("endtime")).getTime();

  var nowtime = new Date().getTime();

  var youtime = endtime-nowtime;

  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);

  if(endtime<=nowtime){

   $(this).html("已过期")

  }else{

   if($(this).attr("lxfday")=="no"){

    $(this).html("<span>"+days+"</span>天<span>"+CHour+"</span>时<span>"+CMinute+"</span>分<span>"+CSecond+"</span>秒");

     }else{

      $(this).html("仅剩<span>"+days+"</span>天<span>"+CHour+"</span>时<span>"+CMinute+"</span>分<span>"+CSecond+"</span>秒");

     }

   }

 });

 setTimeout("lxfEndtime()",1000);

};

<span class="lxftime" endtime="2015-01-02"></span>