直接贴代码：
<pre>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>导航栏滑动效果</title>
<style>
.menu-list{
width: 80%;
margin: auto;
overflow: hidden;
background-color: #01204f;
}
.lavalamp-item{
float: left;
list-style: none;
}
.lavalamp-item a{
text-decoration: none;
line-height: 40px;
font-weight: 700;
margin-right: 2px;
padding: 0 10px;
color: #fff;
width: 100%;
position: relative;
font-size: 100%;
}
.lavalamp{
margin: 0;
}
.icon-new {
position: absolute;
right: -8px;
top: -8px;
width: 26px;
height: 13px;
background: url(http://ns2.bdstatic.com/static/fisp_static/common/img/navbar/icon-new_b295ac1.png) no-repeat;
-webkit-transition: margin .1s;
-o-transition: margin .1s;
transition: margin .1s;
}
.lavalamp-object{
background-color: #c00;
}
</style>
<script src="http://apps.bdimg.com/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
$(function(){
/*
*页面加载完毕获取第一个li的width和top值
*赋值为div#active
/
var divWidth = $("#smooth>li").first().width();
var divLeft = $("#smooth>li").first().position().left;
var firstWidth = divWidth;
var firstLeft = divLeft;
$("#active").css({
width: divWidth,
left: divLeft
});
$("#smooth>li").mouseenter(function(){
/
*mouseenter某个li获取其width和top值
*赋值给#active并加120ms的动画效果
/
divWidth = $(this).width();
divLeft = $(this).position().left;
$("#active").animate({
width: divWidth,
left: divLeft
},120);
});
$("#smooth").mouseleave(function(){
/
*鼠标离开整个div(没有点击li)时
*回到第一个li的位置
*/
$("#active").stop(true,true).animate({
width: firstWidth,
left: firstLeft
},120);
})
})
</script>
</head>
<body>
<div class="menu-list">
<ul class="clearfix lavalamp" style="position: relative;" id="smooth">
<div class="lavalamp-object" id="active" style="position: absolute; height: 40px; top: 0px; left: 0px; overflow: hidden;"></div>
<li class="navitem-index current active lavalamp-item" style="z-index: 5; position: relative;"><a href="http://news.baidu.com/view.html">首页</a></li>
<li class="icon-new-wrapper lavalamp-item" style="z-index: 5; position: relative;"><a href="http://baijia.baidu.com/" id="nav-hot-link" target="_blank"><div class="icon-new"></div>百家</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://finance.baidu.com/">财经</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://yule.baidu.com/">娱乐</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://sports.baidu.com/">体育</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://internet.baidu.com/">互联网</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://fashion.baidu.com/"><div class="icon-new"></div>时尚</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://auto.baidu.com/">汽车</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://guonei.news.baidu.com/">国内</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://guoji.news.baidu.com/">国际</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://mil.news.baidu.com/">军事</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://shehui.news.baidu.com/">社会</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://shipin.news.baidu.com/">视频</a></li>
<li class="media-container lavalamp-item" style="z-index: 5; position: relative;">
<a href="http://media.baidu.com/" target="_blank" class="link-trigger">传媒</a>
<div class="links-container clearfix" style="display: none;">
<a href="http://cankaoxiaoxi.media.baidu.com/" target="_blank">参考消息</a>
<a href="http://infzm.media.baidu.com/" target="_blank">南方周末</a>
<a href="http://pengpai.media.baidu.com/" target="_blank">澎湃</a>
<a href="http://nandu.media.baidu.com/" target="_blank">南方都市报</a>
<a href="http://21cbh.media.baidu.com/" target="_blank">21世纪经济报道</a>
<a href="http://yicai.media.baidu.com/" target="_blank">第一财经日报</a>
<a href="http://huaxi.media.baidu.com/" target="_blank">华西都市报</a>
<a href="http://caixin.media.baidu.com/" target="_blank">财新网</a>
<a href="http://xxcb.media.baidu.com/" target="_blank">潇湘晨报</a>
<a href="http://ynet.media.baidu.com/" target="_blank">北京青年报</a>
</div>
</li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://jian.news.baidu.com/" target="_blank">个性推荐</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://fangchan.news.baidu.com/">房产</a></li>
<li class="lavalamp-item" style="z-index: 5; position: relative;"><a href="http://news.hao123.com/?src=baidunews_1016" mon="toptab=newssite&resouci=1">名站</a></li>
<li class="more-container lavalamp-item" style="z-index: 5; position: relative;">
<a href="#" class="more-trigger">更多</a>
<div class="more-links" style="display: none;">
<a href="http://tech.baidu.com/">科技</a>
<a href="http://lady.baidu.com/">女人</a>
<a href="http://youxi.news.baidu.com/">游戏</a>
</div>
</li>
</ul>
</div>
</body>
</html>
</pre>
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