HTML代码：

div id="times_wrap" class="time_num">
    
 距离结束时间：
 div class="time_w">
    
  b id="times_d" class="time">
     /b>
    天
  b id="times_h" class="time">
     /b>
    时
  b id="times_m" class="time">
     /b>
    分
  b id="times_s" class="time">
     /b>
    秒
 /div>
    
/div>
    

JavaScript代码：

script type="text/javascript">
    
setTimeout("show_time()",1000);
    
var time_wrap = document.getElementByIdx_x("times_wrap");
    
var time_d = document.getElementByIdx_x("times_d");
    
var time_h = document.getElementByIdx_x("times_h");
    
var time_m = document.getElementByIdx_x("times_m");
    
var time_s = document.getElementByIdx_x("times_s");
    

var time_end = new Date("2012/10/29 08:00:00");
     // 设定结束时间
time_end = time_end.getTime();


function show_time(){
    
 var time_now = new Date();
     // 获取当前时间
  time_now = time_now.getTime();
    
 var time_distance = time_end - time_now;
     // 结束时间减去当前时间
 var int_day, int_hour, int_minute, int_second;
    
 if(time_distance >
= 0){
    
  // 天时分秒换算
  int_day = Math.floor(time_distance/86400000)
  time_distance -= int_day * 86400000;
    
  int_hour = Math.floor(time_distance/3600000)
  time_distance -= int_hour * 3600000;
    
  int_minute = Math.floor(time_distance/60000)
  time_distance -= int_minute * 60000;
    
  int_second = Math.floor(time_distance/1000)
 
  // 时分秒为单数时、前面加零站位
  if(int_hour  10)
  int_hour = "0" + int_hour;
    
  if(int_minute  10)
  int_minute = "0" + int_minute;
    
  if(int_second  10)
  int_second = "0" + int_second;
    
  
  // 显示时间
  time_d.innerHTML = int_day;
    
  time_h.innerHTML = int_hour;
    
  time_m.innerHTML = int_minute;
    
  time_s.innerHTML = int_second;
    
  
  setTimeout("show_time()",1000);

 }
else{
    
  time_d.innerHTML = time_d.innerHTML;
    
  time_h.innerHTML = time_h.innerHTML;
    
  time_m.innerHTML = time_m.innerHTML;
    
  time_s.innerHTML = time_s.innerHTML;

 
  // clearTimeout(timerID)
 }

}
    ;
    
/script>
    

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