var timmerID = null
function time() {
var time = document.getElementById("now")
var left = document.getElementById("left")
var t = time.value.split(":")
var hour = parseInt(t[0])
var min = parseInt(t[1])
min=min+1
if(min==60){
hour=hour+1
min=0
if(hour==24){
hour=0
}
}
time.value=hour+":"+min
left.value = left.value-1
if(left.value==0){
mystop()
alert("时间已到！")
}
}
function mystart() {
var left = document.getElementById("left")
left.value="40"
timmerID = window.setInterval("time()", 1000*60)
}
function mystop() {
window.clearInterval(timmerID)
}
html页面：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>time.html</title>
<script type="text/javascript" src="fun.js"></script>
</head>
<body>
时间起点：<input type="text" name="now" id="now" value="0:0"/><input type="button" value="开始" onclick="mystart()"><br>
剩余时间：<input type="text" name="left" id="left" value="40" disabled="disabled"/>分钟<br>
</body>
</html>
补充：这个javascript放在一个文件叫fun.js,在html页面中要引用此文件，如：<script type="text/javascript" src="fun.js"></script>，注意不要把路径弄错了，src后面的路径按照实际的来，如果两个文件在一个目录下，就是如上这样引用，当然也可以直接把全部的js内容放在html文件的头部，如：<script type="text/javascript">
<!--javascript代码-->
</script>
JS实现倒计时(时、分，秒)var
interval
=
1000
function
ShowCountDown(year,month,day,divname)
{
var
now
=
new
Date()
var
endDate
=
new
Date(year,
month-1,
day)
var
leftTime=endDate.getTime()-now.getTime()
var
leftsecond
=
parseInt(leftTime/1000)
//var
day1=parseInt(leftsecond/(24*60*60*6))
var
day1=Math.floor(leftsecond/(60*60*24))
var
hour=Math.floor((leftsecond-day1*24*60*60)/3600)
var
minute=Math.floor((leftsecond-day1*24*60*60-hour*3600)/60)
var
second=Math.floor(leftsecond-day1*24*60*60-hour*3600-minute*60)
var
cc
=
document.getElementById(divname)
cc.innerHTML
=
"脚本之家提示距离"+year+"年"+month+"月"+day+"日还有："+day1+"天"+hour+"小时"+minute+"分"+second+"秒"
}
window.setInterval(function(){ShowCountDown(2010,4,20,'divdown1')},
interval)
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注:如需引入外部Js需刷新才能执行]
