js-倒计时自动隐藏
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
body,div,a,span,i{margin:0;padding:0;}
i{font-style:normal;}
.adtop{ position:relative; width:100%; height:80px; margin:0 auto;}
.adtop a{ position:absolute; width:100%; height:80px; background:#666;}
.adtop span{ position:absolute; right:6px; top:10px; background:#fff; width:150px; height:20px; padding-left:10px;}
.adtop span i{ color:red;}
</style>
</head>
<body>
<div class="adtop" id="adtop">
<a href="#"></a>
<span><i>10 </i>秒之后自动关闭</span>
</div>
<script>
var adtop = document.getElementById("adtop");
var adtopi = adtop.getElementsByTagName("i")[0];
function adClose(s){
s--;
if(s<10)
adtopi.innerHTML="0"+s+" ";
if(s==0){
adTopDo(0);
return;
}
return setTimeout(function(){adClose(s)},1000);
};
function adTopDo(height){
height-=4;
if(height<=80){
adtop.style.marginTop=height+"px";
return setTimeout(function(){adTopDo(height)},20);
};
}
adClose(11);
</script>
</body>
</html>
