JS 时间倒计时

var myDate = new Date();    
myDate.getYear();        //获取当前年份(2位)    
myDate.getFullYear();    //获取完整的年份(4位,1970-????)    
myDate.getMonth();       //获取当前月份(0-11,0代表1月)    
myDate.getDate();        //获取当前日(1-31)    
myDate.getDay();         //获取当前星期X(0-6,0代表星期天)    
myDate.getTime();        //获取当前时间(从1970.1.1开始的毫秒数)    
myDate.getHours();       //获取当前小时数(0-23)    
myDate.getMinutes();     //获取当前分钟数(0-59)    
myDate.getSeconds();     //获取当前秒数(0-59)    
myDate.getMilliseconds();    //获取当前毫秒数(0-999)    
myDate.toLocaleDateString();     //获取当前日期    
var mytime=myDate.toLocaleTimeString();     //获取当前时间    

myDate.toLocaleString( );        //获取日期与时间  

<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS时间倒计时</title>
<script type="text/javascript">
var time_now_server,time_now_client,time_end,time_server_client,timerID;
<!-- 设定起止时间 -->
time_end=new Date("2010/10/4 11:05:1");//结束的时间
time_end=time_end.getTime();
time_now_server=new Date("2010/10/04 11:00:1");//开始的时间
time_now_server=time_now_server.getTime();
 
time_now_client=new Date();
time_now_client=time_now_client.getTime();
<!-- 设定定时时间 -->var a = new Date().getMilliseconds()+5*60*1000;//5分钟
 var b = new Date().getMilliseconds();
 var c = a-b;
time_server_client=time_now_server-time_now_client;
 
setTimeout("show_time()",1000);
 
function show_time()
{
 var timer = document.getElementById("timer");
 if(!timer){
 return ;
 }
 timer.innerHTML =time_server_client;
 
 var time_now,time_distance,str_time;
 var int_day,int_hour,int_minute,int_second;
 var time_now=new Date();
 time_now=time_now.getTime()+time_server_client;
 time_distance=time_end-time_now;
 if(time_distance>0)
 {
  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)
 
  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;
  str_time=int_day+"day"+int_hour+"hour"+int_minute+"minute"+int_second+"second";
  timer.innerHTML=str_time;
  setTimeout("show_time()",1000);
 }
 else
 {
  timer.innerHTML =timer.innerHTML;
  clearTimeout(timerID)
 }
}
</script>
</head>
 
<body>
<div id="timer">8888</div>
</body>
</html>