<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>100s倒计时</title>
<style>
body,div{margin:0;padding:0;}
body{color:#fff;font:16px/1.5 5fae8f6f96c59ed1;}
#countdown{300px;text-align:center;background:#000;margin:10px auto;padding:20px 0;}
input{border:0;283px;height:50px;cursor:pointer;margin-top:20px;background:url(
) no-repeat;}
input.cancel{background-position:0 -50px;}
span{color:#000;80px;line-height:2;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}
</style>
<script>
window.onload = function(){
var oCount = document.getElementById('countdown'),
oInput = oCount.getElementsByTagName('input')[0],
aSpan = oCount.getElementsByTagName('span'),
timer = null;
oInput.addEventListener('click',function(){
this.className == ''?(timer = setInterval(updateTime,1000)):clearInterval(timer);
this.className = this.className === 'cancel'?'':'cancel';
},false);
function format(a){
return a.toString().replace(/^(d)$/,'0$1');
}
function updateTime(){
//console.log(aSpan[0].innerHTML);
var remain = parseInt(aSpan[0].innerHTML.replace(/^0/,''))*60+parseInt(aSpan[1].innerHTML.replace(/^0/,''));
if (remain <= 0) {
clearInterval(timer);
return;
}
remain--;
aSpan[0].innerHTML = format(parseInt(remain/60));
aSpan[1].innerHTML = format(remain%60);
}
}
</script>
</head>
<body>
<div id="countdown">
<span>01</span>分钟<span>40</span>秒
<input type="button" value="" />
</div>
</body>
</html>
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