How to implement jQuery page countdown and refresh effects

var intDiff = parseInt(600);//倒计时总秒数量
    function timer(intDiff){
      window.setInterval(function(){
      var day=0,
        hour=0,
        minute=0,
        second=0;//时间默认值    
      if(intDiff > 0){
        day = Math.floor(intDiff / (60 * 60 * 24));
        hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
        minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
        second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
      }else{//当时间耗尽，刷新页面
        window.location.reload();
      }
      if (minute <= 9) minute = &#39;0&#39; + minute;
      if (second <= 9) second = &#39;0&#39; + second;
      $(".timeShow").html(&#39;本页数据还剩下<font>&#39;+minute+&#39;分&#39;+second+&#39;</font>秒刷新,刷新间隔时间: 10 分钟&#39;);
      intDiff--;
      }, 1000);
    } 
    $(function(){
      timer(intDiff);
    });

<span class="timeShow"></span>