js实现100秒倒计时和简易时钟

<!DOCTYPE html>

<html>

<head>

<style>

body,div{margin:0;padding:0;}

body{color:#fff;font:16px/1.5 \5fae\8f6f\96c5\9ed1;}

#countdown{width:300px;text-align:center;background:#000;margin:10px auto;padding:20px 0;}

input{border:0;width:283px;height:50px;cursor:pointer;margin-top:20px;background:url(
) no-repeat;}

input.cancel{background-position:0 -50px;}

span{color:#000;width:80px;line-height:2;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}

</style>

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>

<span>01</span>分钟<span>40</span>秒

</div>

</body>

</html>

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posted @ 2017-04-08 10:24 倪殤阅读(739) 评论(0) 收藏举报

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