<script>
var myVar = setInterval(myTimer, 1000)
function myTimer() {
var d = new Date()
document.getElementById("demo").innerHTML = d.toLocaleTimeString()
}
</script>
<html><body>
<div id="RemainH"></div>
<div id="RemainM"></div>
<div id="RemainS"></div>
</body>
<script language="JavaScript">
//var runtimes = 0
function GetRTime(lefttime,runtimes){
var nMS = lefttime*1000-runtimes*1000
var nH=Math.floor(nMS/(1000*60*60))%24
var nM=Math.floor(nMS/(1000*60)) % 60
var nS=Math.floor(nMS/1000) % 60
if(nS == 0 &&nH == 0 &&nM == 0){
alert('活动开始')
return false
}
document.getElementById("RemainH").innerHTML=(nH)
document.getElementById("RemainM").innerHTML=(nM)
document.getElementById("RemainS").innerHTML=(nS)
if(nMS>5*59*1000&&nMS<=5*60*1000){
alert("还有最后五分钟！")
}
runtimes++
//setTimeout("GetRTime()",1000)
setTimeout(function(){
GetRTime(lefttime,runtimes)
},1000)
}
window.onload=GetRTime(30000,0)
</script>
</html>
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]
