慢慢展开再慢慢收起的javascript广告效果

dn001 2010-06-25 19:34:03

在蓝色理想论坛里看到了wuleying贴出的一段代码，可以实现网易首页顶部慢慢展开再慢慢收起的广告效果，非常不错，转过来与大家分享。

<!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>
<FCK:meta http-equiv="Content-Type" content="text/html; charset=gb2312"  />
<title>脚本之家 效果代码</title>
<style>
*{margin:0;padding:0;}
body {height:2000px;}
#menu {
width:220px;
height:420px;
position:absolute;
z-index:1000;
background:url(/upload/20080421090108362.gif) repeat-x top left;
}
#menu_h {
float:right;
}
#menu_h img {
cursor:pointer;
}
#menu_c {
width:188px;
height:398px;
border:1px solid #666;
background:#ecf6f5;
margin:12px 0 0 5px;
}
#menu_c h2 {
text-align:center;
}
</style>
</head>
<body>
<div id="ads" style="width:900px;height:300px;background:#369;margin:0 auto;"></div>
<script type="text/javascript"> 
var time = 300; 
var h = 0; 
function addCount() 
{ 
    if(time>0) 
    { 
        time--; 
        h = h+5; 
    } 
    else 
    { 
        return; 
    } 
    if(h>300)  //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); //停留时间自己调了 
} 
var T = 300; 
var N = 300; //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>
</body>
</html>

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