JS如何倒计时？用PHP+JS的，比如倒计时20秒要怎么操作？倒计时20秒后就执行动作吗？

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JS如何倒计时？用PHP+JS的，比如倒计时20秒要怎么操作？倒计时20秒后就执行动作吗？,第1张

window.setTimeout("setPopTitle()",20*1000)\x0d\x0afunction setPopTitle()\x0d\x0a{\x0d\x0aalert("20秒到了")\x0d\x0a}\x0d\x0a如果是20秒后想调后台，就用ajax直接调

<!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/htmlcharset=gb2312" />

<title>JS实现倒计时(时、分，秒)</title>

<script language="javascript" type="text/javascript">

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 = "百度提示距离"+year+"年"+month+"月"+day+"日还有："+day1+"天"+hour+"小时"+minute+"分"+second+"秒"} window.setInterval(function(){ShowCountDown(2016,6,5,'divdown1')

}, interval)

</script>

</head>

<body>

<div id="divdown1"></div>

</body>

</html>

给你提供个思路