计时器js

<html>
   <head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
   </head>

   <body>
       <div class="time">
           <span style="position:relative;top:45%;left:4.5%">距离活动开始时间：<span id="timer" style="color:;"></span></span>
       </div>
       <script language="javascript">
       function getintveral()
       {
           var d1=new Date();
           var d2=new Date(2015,11,24,23,59,59);
           var t1=d1.getTime();
           var t2=d2.getTime();
           var t3=parseInt(parseInt(t2-t1)/1000);
           var d=parseInt(t3/86400);
           var h=parseInt((t3-(d*86400))/3600);
           var m=parseInt((t3-(d*86400)-(h*3600))/60);
           var s=parseInt(t3-(d*86400)-(h*3600)-(m*60));
           timer.innerHTML=d+"天"+h+"小时"+m+"分"+s+"秒";
       }
       setInterval(getintveral,1000);
       </script>
   </body>
</html>