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JS实时倒计时

时间：2020-07-20 来源：作者：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>实时倒计时</title>
<script language="JavaScript">
var DifferenceHour = -1
var DifferenceMinute = -1
var DifferenceSecond = -1
var Tday = new Date("Jan 1, 2083 00:00:00")   //**倒计时时间点-注意格式
var daysms = 24 * 60 * 60 * 1000
var hoursms = 60 * 60 * 1000
var Secondms = 60 * 1000
var microsecond = 1000
function clock()
{
var time = new Date()
var hour = time.getHours()
var minute = time.getMinutes()
var second = time.getSeconds()
var timevalue = ""+((hour > 12) ? hour-12:hour)
timevalue +=((minute < 10) ? ":0":":")+minute
timevalue +=((second < 10) ? ":0":":")+second
timevalue +=((hour >12 ) ? " PM":" AM")
var convertHour = DifferenceHour
var convertMinute = DifferenceMinute
var convertSecond = DifferenceSecond
var Diffms = Tday.getTime() - time.getTime()
DifferenceHour = Math.floor(Diffms / daysms)
Diffms -= DifferenceHour * daysms
DifferenceMinute = Math.floor(Diffms / hoursms)
Diffms -= DifferenceMinute * hoursms
DifferenceSecond = Math.floor(Diffms / Secondms)
Diffms -= DifferenceSecond * Secondms
var dSecs = Math.floor(Diffms / microsecond)
if(convertHour != DifferenceHour) document.formnow.dd.value=DifferenceHour
if(convertMinute != DifferenceMinute) document.formnow.hh.value=DifferenceMinute
if(convertSecond != DifferenceSecond) document.formnow.mm.value=DifferenceSecond
document.formnow.ss.value=dSecs
setTimeout("clock()",1000)
}
</script>
<style type="text/css">
input{
border:0;
color:#f00;
width:40px;
}
</style>
</head>
<body onload="clock();return true">
距离2083年元旦还有：
<form name="formnow">
<input name="dd" type="text" />天
<input name="hh" type="text" />小时
<input name="mm" type="text" />分
<input name="ss" type="text" />秒
</form>
</body>
</html>
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