代码简介：
鼠标悬停时动态翻滚的导航条，这个是使用JavaScript实现的，不过代码好像是从jQuery里摘出来的，有点像。
代码内容：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>JavaScript+Css实现的鼠标悬停时动态翻滚的紫色菜单导航_网页代码站()</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(/images/1111/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(/images/1111/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(/images/1111/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><a href="#">网页代码站</a></li><li><a href="#">网页特效</a></li><li><a href="#">工具软件</a></li><li><a href="#">源码下载</a></li><li><a href="#">菜单导航</a></li><li><a href="#">层和布局</a></li><li><a href="#">论坛社区</a></li><li><a href="#">广告联系</a></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><br><p><a href="">网页代码站</a> - 最专业的代码下载网站 - 致力为中国站长提供有质量的代码！</p>
代码来自：/webcode/2c7e2d7a-56a9-44b4-9356-4bbb40689b16.html
