javascript实现的鼠标悬停时动态翻滚的导航条

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>动态翻滚的导航条</title> 
<style type="text/css"> 
.clear:after{content:"."; display:block; height:0; clear:both; visibility:hidden}.clear{display:inline-block}.clear{display:block} 
div#nav{height:32px; background:url(http://files.phpstudy.net/demoimg/200911/YL29.jpg) repeat-x} 
div#nav ul{ 
width:705px; 
list-style:none; 
margin-top: 0; 
margin-right: auto; 
margin-bottom: 0; 
margin-left: 0px; 
} 
div#nav ul li{ 
float:left; 
height:32px; 
overflow:hidden; 
background-image: url(http://files.phpstudy.net/demoimg/200911/YL30.jpg); 
background-repeat: repeat-y; 
background-position: right 0; 
padding-top: 0; 
padding-right: 1px; 
padding-bottom: 0; 
padding-left: 0px; 
font-family: Arial; 
font-size: 12px; 
line-height: 32px; 
font-weight: bold; 
} 
div#nav ul li a{ 
float:left; 
height:100%; 
width: 77px; 
background:url(http://files.phpstudy.net/demoimg/200911/YL28.jpg) repeat-x; 
color:#fff; 
text-decoration:none; 
padding-top: 0; 
padding-right: 5px; 
padding-bottom: 0; 
padding-left: 5px; 
text-align:center; 
} 
div#nav ul li a.hover{ 
clear:both; 
background-position:0 -32px; 
width: 77px; 
} 
div#nav ul li.on a{ 
background-position:0 -32px; 
} 
div#nav ul li.nobg{background:none} 
/* ]]> */ 
</style> 
</head> 
<body> 
<div id="nav"> 
<ul class="clear"> 
<li>phpStudy</li> 
<li>网页特效</li> 
<li>工具软件</li> 
<li>源码下载</li> 
<li>菜单导航</li> 
<li>层和布局</li> 
<li>论坛社区</li> 
<li>广告联系</li> 
<li class="nobg"></li> 
</ul> 
</div> 
<script type="text/javascript"> 
/* <![CDATA[ */ 
function nav(c, config){ 
this.config = config || {speed: 10, num: 2}; 
this.container = (typeof(c)=="object") ? c : document.getElementById(c); 
this.lineHeight = this.container.offsetHeight; 
this.scrollTimeId = null; 
var _this = this; 
this.__construct = function (){ 
var inner,el,href; 
inner = _this.container.childNodes[0].innerHTML; 
href = _this.container.childNodes[0].href; 
el = document.createElement("a"); 
el.innerHTML = inner; 
el.href = href; 
el.className = 'hover'; 
_this.container.appendChild(el); 
_this.container.onmouseover = function (){_this.start()}; 
_this.container.onmouseout = function (){_this.end()}; 
}(); 
this.start = function (){ 
_this.clear(); 
_this.scrollTimeId = setTimeout(function(){_this.scrollUp();}, _this.config.speed); 
}; 
this.end = function (){ 
_this.clear(); 
_this.scrollTimeId = setTimeout(function(){_this.scrollDown();}, _this.config.speed); 
}; 
this.scrollUp = function (){ 
var c = _this.container; 
if(c.scrollTop >= _this.lineHeight){c.scrollTop = _this.lineHeight;return;} 
c.scrollTop += _this.config.num; 
_this.scrollTimeId = setTimeout(function(){_this.scrollUp();}, _this.config.speed); 
}; 
this.scrollDown = function (){ 
var c = _this.container;

if(c.scrollTop <= 0){c.scrollTop = 0;return;} 
c.scrollTop -= _this.config.num; 
_this.scrollTimeId = setTimeout(function(){_this.scrollDown();}, _this.config.speed); 
}; 
this.clear = function (){clearTimeout(_this.scrollTimeId)}; 
} 
(function(){ 
var container = document.getElementById('nav'); 
var el_li = container.getElementsByTagName('li'); 
var arr = []; 
for( var i = 0; i < el_li.length; i++){ 
if(el_li[i].className == 'on') continue; 
arr[i] = new nav(el_li[i], {speed: 10, num: 4}); 
} 
}) 
(); 
/* ]]> */ 
</script> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

如果大家不喜欢这个颜色，可以修改代码中的图片的颜色即可。

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