怎样将秒数转换成 小时:分钟的格式

<script>
   /**  

   * @param {} second  

   * @return {}  

   * @desc 秒转化成dd hh:mm:ss  

   */ 

   function dateFormat(second){  

      var dd,hh,mm,ss;  

      second = typeof second === 'string' ? parseInt(second) : second;  

      if(!second || second < 0){  

          return;  

      }  

      //天  

      dd = second / (24 * 3600) | 0;  

      second = Math.round(second) - dd * 24 * 3600;  

      //小时  

      hh = second / 3600 | 0;  

      second = Math.round(second) - hh * 3600;  

      //分  

      mm = second / 60 | 0;  

      //秒  

      ss = Math.round(second) - mm * 60;  

      if(Math.round(dd) < 10){  

          dd = dd > 0 ? '0' + dd : '';  

      }  

      if(Math.round(hh) < 10){  

          hh = '0' + hh;  

      }  

      if(Math.round(mm) < 10){  

          mm = '0' + mm;  

      }  

      if(Math.round(ss) < 10){  

          ss = '0' + ss;  

      }  

      alert( dd + ' ' + hh + ':' + mm + ':' + ss);  

  }


</script>