使用JS显示倒计时数字时钟效果
本文实例讲述了JS实现的网页倒计时数字时钟效果。分享给大家供大家参考。具体实现方法如下：
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<head>
<metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/>
<title>javascript实现的倒计时时钟</title>
<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:#1a1a1a;margin:10pxauto;padding:20px0;}
input{border:0;width:283px;height:50px;cursor:pointer;margin-top:20px;background:url(https://www.nhooo.com/jscss/demoimg/201210/btn-1.png)no-repeat;}
input.cancel{background-position:0-50px;}
span{color:#000;width:80px;line-height:2;background:#fbfbfb;border:2pxsolid#b4b4b4;margin:010px;padding:010px;}
</style>
<script>
window.onload=function()
{
varoCountDown=document.getElementById("countdown");
varaInput=oCountDown.getElementsByTagName("input")[0];
vartimer=null;
aInput.onclick=function()
{
this.className==""?(timer=setInterval(updateTime,1000),updateTime()):(clearInterval(timer));
this.className=this.className==''?"cancel":'';
};
functionformat(a)
{
returna.toString().replace(/^(\d)$/,'0$1')
}
functionupdateTime()
{
varaSpan=oCountDown.getElementsByTagName("span");
varoRemain=aSpan[0].innerHTML.replace(/^0/,'')*60+parseInt(aSpan[1].innerHTML.replace(/^0/,''));
if(oRemain<=0)
{
clearInterval(timer);
return
}
oRemain--;
aSpan[0].innerHTML=format(parseInt(oRemain/60));
oRemain%=60;
aSpan[1].innerHTML=format(parseInt(oRemain));
}
}
</script>
</head>
<body>
<divid="countdown">
<span>01</span>分钟<span>40</span>秒
<inputtype="button"value=""/>
</div>
</body>
</html>
通过本文的了解。希望本文所述对大家JS程序设计有所帮助。