javaScript timer控制

 <script type="text/javascript">
         var num = ;
         //间隔一秒循环执行
         var id = setInterval(function ()
         {
             num = num + ;
             document.getElementById("ss").value = num;
         }, );

         //间隔一秒执行一次
         var ids = setTimeout(function () {
             num = num + ;
             document.getElementById("ss").value = num;
         }, );
         //停止方法
         function stopModth() {
             clearInterval(id);
             clearTimeout(ids);
         }
    </script>