<p>
<label for="deadline">截止日期</label>
<input type="text" value="2011-06-11" id="deadline" />
<input type="button" value="開始倒計(jì)時(shí)" onclick="window.setInterval('countDown(\'deadline\')', 1000)" />
</p>
<p id="showTime"></p>

function countDown(endDate) {
var now = new Date();
var deadtime = document.getElementById(endDate);
var deadline = new Date(deadtime.value);
//本地時(shí)間與格林威治標(biāo)準(zhǔn)時(shí)間 (GMT) 的分鐘差
var timeDiff = now.getTimezoneOffset();
//此處有些不解，如果把分鐘差轉(zhuǎn)化成毫秒應(yīng)該是timeDiff*60*1000，但是這樣返回的數(shù)據(jù)不正確！
var leave = Math.abs(deadline.getTime() - now.getTime() + timeDiff*60);
var minute = 1000 * 60;
var hour = minute * 60;
var day = hour * 24;
var countDay = Math.floor(leave/day);
//var countHour = Math.floor((leave - day*countDay)/hour); 兩種計(jì)算思路
var countHour = Math.floor(leave/hour - countDay*24);
var countMinute = Math.floor(leave/minute) - countDay*24*60 - countHour*60;
var countSecond = Math.floor(leave/1000) - countDay*24*60*60 - countHour*60*60 - countMinute*60;
var outStr = "";
if(deadline < now) {
outStr = "距離"+deadtime.value+"已有"+countDay+"天"+countHour+"小時(shí)"+countMinute+"分"+countSecond+"秒";
} else {
outStr = "距離"+deadtime.value+"還差"+countDay+"天"+countHour+"小時(shí)"+countMinute+"分"+countSecond+"秒";
}
var showTime = document.getElementById("showTime");
showTime.innerHTML = outStr;
}