js 根据开始日期和结束日期显示倒计时
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf8" />
<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;
time_end=new Date("2013 09 03 18:50:50");//结束的时间
time_end=time_end.getTime();
time_now_server=new Date("2013 09 03 17:12:50");//开始的时间
time_now_server=time_now_server.getTime();
time_now_client=new Date();
time_now_client=time_now_client.getTime();
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+"天"+int_hour+"小时"+int_minute+"分钟"+int_second+"秒";
timer.innerHTML=str_time;
setTimeout("show_time()",1000);
}else{
timer.innerHTML =timer.innerHTML;
clearTimeout(timerID)
}
}
</script>
</head>
<body>
<div id="timer"> </div>
</body>
</html>
