js倒计时天时分秒

javascript代码：

 

   <script language="JavaScript"> 
  
<!--   
  //
   
  
   
  function getQueryString(name) { 
  
     
  var reg = 
  new RegExp("(^|&)"+ name +"=([^&]*)(&|$)", "i"); 
  
     
  var r = window.location.search.substr(1).match(reg); 
  
     
  if (r != 
  null)  
  return unescape(r[2]); returnnull; 
  
  } 
  
 
  
   
  var currentDate =  
  new Date(); 
  
   
  var strEndTime = getQueryString("EndTime"); 
  // 
  http://www.abc.com/page.html?EndTime=2012/10/23 10:20:30 
  
   
  var EndTime= 
  new Date(strEndTime); 
  
   
  
   
  var days= EndTime - currentDate;  
  
  EndTimeMsg = parseInt(days / 1000); 
  // 
  精确到秒 
  
 
  
   
  function show() { 
  
    h = Math.floor(EndTimeMsg / 60 / 60); 
  
    m = Math.floor((EndTimeMsg - h * 60 * 60) / 60); 
  
    s = Math.floor((EndTimeMsg - h * 60 * 60 - m * 60)); 
  
    document.getElementById("DD").innerHTML = parseInt(h/24); 
  
    document.getElementById("HH").innerHTML = h; 
  
    document.getElementById("MM").innerHTML = m; 
  
    document.getElementById("SS").innerHTML = s; 
  
    EndTimeMsg--; 
  
     
  if (EndTimeMsg < 0) 
  
    { 
  
        document.getElementById("DD").innerHTML = "0"; 
  
        document.getElementById("HH").innerHTML = "00"; 
  
        document.getElementById("MM").innerHTML = "00"; 
  
        document.getElementById("SS").innerHTML = "00";; 
  
    } 
  
  } 
  
  setInterval("show()", 1000) 
  
   
  
 
  // 
   --> 
  
</script> 
 

 

html代码：

 
  < 
  div 
  > 
  
   
  < 
  strong  
  id 
  ="DD" 
  ></ 
  strong 
  >天  
  < 
  strong  
  id 
  ="HH" 
  ></ 
  strong 
  >时  
  < 
  strong  
  id 
  ="MM" 
  ></ 
  strong 
  >分  
  < 
  strong  
  id 
  ="SS" 
  ></ 
  strong 
  >秒 
  
 
  </ 
  div 
  >