向上滚动：
<!doctype html>
<title>javascript无缝滚动</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript无缝滚动" />
<meta name="description" content="javascript无缝滚动" />
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<style type="text/css">
h1 {
font:400 16px/1 "Microsoft YaHei",KaiTi_GB2312,SimSun
}
#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:2px solid #369;
}
#marquee li {
position:absolute;
}
#marquee img {
display:block;
border:0;
}
</style>
<script type="text/javascript">
var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li")[0],
speed = arguments[1] || 10,
delta = 0,//当前滚动的位置
critical = slide.offsetHeight;//临界点
slide.innerHTML += slide.innerHTML;
var rolling = function(){
delta == -critical ? delta = 0 : delta--;
slide.style.top = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
window.onload = function(){
Marquee("marquee");
}
</script>
<h1>javascript无缝滚动(向上滚动)</h1>
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<ul id="marquee">
<li>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s017.jpg"
/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s018.jpg"
></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s019.jpg"
/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s020.jpg"
></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s021.jpg"
"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s022.jpg"
"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s023.jpg"/></a>
</li>
</ul>
运行代码