Jquery+CSS 创建流动导航菜单 Fluid Navigation

那么我们应该如何实现流动导航菜单呢？
一、效果图

鼠标滑过Menu，即Show提示信息。
二、实现步骤
1、CSS代码

menuBarHolder { width: 730px; height:45px; background-color:#000; color:#fff; font-family:Arial; font-size:14px; margin-top:20px;} 
#menuBarHolder ul{ list-style-type:none; display:block;} 
#container { margin-top:100px;} 
#menuBar li{ float:left; padding:15px; height:16px; width:50px; border-right:1px solid #ccc; } 
#menuBar li a{color:#fff; text-decoration:none; letter-spacing:-1px; font-weight:bold;} 
.menuHover { background-color:#999;} 
.firstchild { border-left:1px solid #ccc;} 
.menuInfo { cursor:hand; background-color:#000; color:#fff; 
width:74px; font-size:11px;height:100px; padding:3px; display:none; 
position:absolute; margin-left:-15px; margin-top:-15px; 
-moz-border-radius-bottomright: 5px; 
-moz-border-radius-bottomleft: 5px; 
-webkit-border-bottom-left-radius: 5px; 
-webkit-border-bottom-right-radius: 5px; 
-khtml-border-radius-bottomright: 5px; 
-khtml-border-radius-bottomleft: 5px; 
border-radius-bottomright: 5px; 
border-radius-bottomleft: 5px; 
} 

menuBarHolder: 菜单Menu的固定容器，宽度=730px。
menuInfo：控制提示信息的展示与否。
2、HTML代码

复制代码代码如下:

<div id="menuBarHolder"> 
<ul id="menuBar"> 
<li class="firstchild"><a href="javascript:#">Home</a> 
<div class="menuInfo">I am some text about the home section</div></li> 
<li><a href="javascript:#">Services</a> 
<div class="menuInfo">I am some text about the services section</div></li> 
<li><a href="javascript:#">Clients</a> 
<div class="menuInfo">I am some text about the clients section</div></li> 
<li><a href="javascript:#">Portfolio</a> 
<div class="menuInfo">I am some text about the portfolio section</div></li> 
<li><a href="javascript:#">About</a> 
<div class="menuInfo">I am some text about the about section</div></li> 
<li><a href="javascript:#">Blog</a> 
<div class="menuInfo">I am some text about the blog section</div></li> 
<li><a href="javascript:#">Follow</a> 
<div class="menuInfo">I am some text about the follow section</div></li> 
<li><a href="javascript:#">Contact</a> 
<div class="menuInfo">I am some text about the contact section</div></li> 
</ul> 
</div> 

UI LI元素：列表元素。
DIV元素：提示内容信息。
3、Javascript代码

复制代码代码如下:

$(document).ready(function() 
{ 
$('#menuBar li').click(function() 
{ 
var url = $(this).find('a').attr('href'); 
document.location.href = url; 
}); 
$('#menuBar li').hover(function() 
{ 
$(this).find('.menuInfo').slideDown(); 
}, 
function() 
{ 
$(this).find('.menuInfo').slideUp(); 
}); 
}); 

click()、 hover():给Li元素绑定单击事件和鼠标滑过事件。
find()函数：搜索所有与指定表达式匹配的元素。这个函数是找出正在处理的元素的后代元素的好方法。
slideDown(speed, [callback])：通过高度变化（向下增大）来动态地显示所有匹配的元素，在显示完成后可选地触发一个回调函数。
slideUp(speed, [callback])：通过高度变化（向上减小）来动态地隐藏所有匹配的元素，在隐藏完成后可选地触发一个回调函数。

<html><style type="text/css"> #menuBarHolder { width: 730px; height:45px; background-color:#000; color:#fff; font-family:Arial; font-size:14px; margin-top:20px;} #menuBarHolder ul{ list-style-type:none; display:block;} .firstchild { border-left:1px solid #ccc;} #container { margin-top:100px;} #menuBar li{ float:left; padding:15px; height:16px; width:50px; border-right:1px solid #ccc; } #menuBar li a{color:#fff; text-decoration:none; letter-spacing:-1px; font-weight:bold;} .menuHover { background-color:#999;} .menuInfo { cursor:hand; background-color:#000; color:#fff; width:74px; font-size:11px;height:100px; padding:3px; display:none; position:absolute; margin-left:-15px; margin-top:-15px; -moz-border-radius-bottomright: 5px; -moz-border-radius-bottomleft: 5px; -webkit-border-bottom-left-radius: 5px; -webkit-border-bottom-right-radius: 5px; -khtml-border-radius-bottomright: 5px; -khtml-border-radius-bottomleft: 5px; border-radius-bottomright: 5px;border-radius-bottomleft: 5px; } h1 { font: 50px normal Georgia, 'Times New Roman', Times, serif; color: #111; margin: 0; text-align: center; padding: 5px 0; } h1 small{ font: 0.2em normal Verdana, Arial, Helvetica, sans-serif; text-transform:uppercase; letter-spacing: 1.4em; display: block; color: #ccc; } </style><script src="http://code.jquery.com/jquery-1.4.1.min.js"></script><script type="text/javascript"> $(document).ready(function() { $('#menuBar li').click(function() { var url = $(this).find('a').attr('href'); document.location.href = url; }); $('#menuBar li').hover(function() { $(this).find('.menuInfo').slideDown(); }, function() { $(this).find('.menuInfo').slideUp(); }); }); </script><center><div id="container"><h1>Fluid NavigationCSS & jQuery <small>Tutorial by Addy Osmani</small></h1><div id="menuBarHolder"><ul id="menuBar"><li class="firstchild"><a href="javascript:#">Home</a><div class="menuInfo">I am some text about the home section</div></li><li><a href="javascript:#">Services</a><div class="menuInfo">I am some text about the services section</div></li><li><a href="javascript:#">Clients</a><div class="menuInfo">I am some text about the clients section</div></li><li><a href="javascript:#">Portfolio</a><div class="menuInfo">I am some text about the portfolio section</div></li><li><a href="javascript:#">About</a><div class="menuInfo">I am some text about the about section</div></li><li><a href="javascript:#">Blog</a><div class="menuInfo">I am some text about the blog section</div></li><li><a href="javascript:#">Follow</a><div class="menuInfo">I am some text about the follow section</div></li><li><a href="javascript:#">Contact</a><div class="menuInfo">I am some text about the contact section</div></li></ul></div></div></center></html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]