网页特效代码实例,打开网页后定时显示大图片广告然后自动关闭,一些门户比如163首页就有这种广告效果.
<!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>
<title>顶部展出的大幅广告</title>
<script type="text/javascript" language="javascript">
var time = 500;
var h = 0;
function addCount()
{
if(time>0)
{
time--;
h = h+5;
}
else
{
return;
}
if(h>500) //高度
{
return;
}
document.getElementById("ads").style.display = "";
document.getElementById("ads").style.height = h+"px";
setTimeout("addCount()",30);
}
window.onload = function showAds()
{
addCount();
setTimeout("noneAds()",7000); //停留时间自己适当调整
}
</script>
<script type="text/javascript" language="javascript">
var T = 500;
var N = 500; //高度
function noneAds()
{
if(T>0)
{
T--;
N = N-5;
}
else
{
return;
}
if(N<0)
{
document.getElementById("ads").style.display = "none";
return;
}
document.getElementById("ads").style.height = N+"px";
setTimeout("noneAds()",30);
}
</script>
</head>
<body>
<div id="ads" style="margin:auto; display:none; width:900px; top:0px; height:0px; border:solid 1px #000; background-color:#fafafa; overflow:hidden; text-align:center;">
<a target="_blank" href="http://www.knowsky.com">网页教学网地址：http://www.knowsky.com</a>
</div>
<div style="margin:auto; width:900px; height:200px; border:solid 1px #000; background-color:#fafafa; text-align:center;">
网站主体内容
</div>
</body>
</html>
