本文实例讲述了jquery实现滑屏大图定时收缩为小banner图片的广告代码。分享给大家供大家参考。具体如下：
这是一款基于jQuery实现的JS广告特效，滑屏大图广告定时收缩为小banner图片广告代码，这种广告在各大门户网站现在还能看得到，刚打开网页的时候可以看到滑下来的大图片广告，过一会，广告自动缩小变成了一个banner横幅广告，并带有关闭按钮，可以关闭广告，对于广告来说，这个代码挺实用。
<!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>jQuery顶部大图定时缩为小广告可关闭代码</title>
<style>
body {
margin:0;
padding:0;
}
img {
border:0
}
.root1200 {
width:1200px;
height:100px;
margin:0 auto;
overflow:visible
}
.wrapper em {
width:40px;
height:15px;
float:left;
color:#FFF;
font-size:12px;
font-family:Verdana, Geneva, sans-serif;
background:#333;
margin:0 0 -20px 10px;
padding:2px 5px 2px 10px;
z-index:999;
position:absolute;
top:10px;
}
</style>
<script language="javascript" src="js/jquery-1.7.2.min.js"></script>
</head>
<body>
<script type="text/javascript">
/*
* 宽窄屏切换
* */
var bigscreen = false;
if ( screen.width>=1200 ) {
bigscreen = true;
var bodyTag = document.getElementsByTagName("body")[0],
bodyClassName = bodyTag.getAttribute("className") || bodyTag.getAttribute("class");
bodyClassName = bodyClassName ? bodyClassName+" " : "";
bodyTag.className = bodyClassName+"root1200";
}
</script>
<div class="wrapper" id="snActive-wrap"> <em title="关闭广告">Close</em> <a target="_blank" name="redbaby_none_ggw_dt01" title="小图" href="/"></a> <a target="_blank" name="redbaby_none_ggw_dt01" title="大图" href="/"></a> </div>
<script type="text/javascript">
~function (){
var snActive = window.snActive = document.getElementById("snActive-wrap"),
a = snActive.getElementsByTagName("a"),
h = 0, w, imgSrc = [];
if (bigscreen){
w = 1190;
imgSrc[0] = "images/1390124030537_1200.jpg";// 40
imgSrc[1] = "images/1390124049068_1200.jpg";// 500
} else {
w = 990;
imgSrc[0] = "images/1390124028186.jpg";// 40
imgSrc[1] = "images/1390124043025.jpg";// 500
}
snActive.style.overflow = 'hidden';
a[0].style.display = "none";
a[0].innerHTML += '<img width="' + w + '" height="40" src="' + imgSrc[0] + '" style="display:block" />';
if(a[1]){
a[1].innerHTML += '<img width="' + w + '" height="500" src="' + imgSrc[1] + '" style="display:block" />';
}
}();
//关闭通栏广告
var snActive = $(snActive),
hideImg = snActive.find('a:hidden'),
em = snActive.find("em");
timeout = !1;
if(hideImg[0]) {
timeout = setTimeout(function(){
snActive.animate({height:40},600,function(){
hideImg.siblings('a:visible').hide();
hideImg.show();
em.show().live("click",function(){
snActive.slideUp(300);
});
});
}, 3000)
}
</script>
<div style="text-align:center;clear:both"> </div>
</body>
</html>
