本文实例讲述了jquery实现鼠标滑过显示二级下拉菜单效果。分享给大家供大家参考。具体如下：
这是一款jquery实现的下拉菜单，当鼠标移在主菜单上的时候，向下滑出二级子菜单，采用UL LI结构，便于修改完善，我觉得是很实用的菜单，希望大家平时能用得上。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/jquery-mouse-over-show-menu-codes/
具体代码如下：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery下拉菜单</title>
<script type="text/javascript" src="jquery-1.6.2.min.js"></script>
<style>
* { margin: 0; padding: 0; }
body {font-family: Arial, Tahoma, sans-serif; font-size: 11px; color: #232323; }
.wrap { width: 800px; margin: 0 auto; }
#nav { margin: 0; padding: 0; list-style: none; border-left: 1px solid #d5dce8; border-right: 1px solid #d5dce8; border-bottom: 1px solid #d5dce8; border-bottom-left-radius: 4px; -moz-border-radius-bottomleft: 4px; -webkit-border-bottom-left-radius: 4px; border-bottom-right-radius: 4px; -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 4px; height: 50px; padding-left: 15px; padding-right: 15px; background: #edf3f7; }
#nav li { float: left; display: block; background: none; position: relative; z-index: 999; margin: 0 1px; }
#nav li a { display: block; padding: 0; font-weight: 700; line-height: 50px; text-decoration: none; color: #818ba3; zoom: 1; border-left: 1px solid transparent; border-right: 1px solid transparent; padding: 0px 12px; }
#nav li a:hover, #nav li a.hov { background-color: #fff; border-left: 1px solid #d5dce8; border-right: 1px solid #d5dce8; color: #576482; }
#nav ul { position: absolute; left: 1px; display: none; margin: 0; padding: 0; list-style: none; -moz-box-shadow: 0 1px 3px rgba(0,0,0,0.2); -o-box-shadow: 0 1px 3px rgba(0,0,0,0.2); box-shadow: 0 1px 3px rgba(0,0,0,0.2); -webkit-box-shadow: 0 1px 3px rgba(0,0,0,0.2); padding-bottom: 3px; }
#nav ul li { width: 180px; float: left; border-top: 1px solid #fff; text-align: left; }
#nav ul li:hover { border-left: 0px solid transparent; border-right: 0px solid transparent; }
#nav ul a { display: block; height: 20px; line-height: 20px; padding: 8px 5px; color: #666; border-bottom: 1px solid transparent; text-transform: uppercase; color: #797979; font-weight: normal; }
#nav ul a:hover { text-decoration: none; border-right-color: transparent; border-left-color: transparent; background: transparent; color: #4e4e4e; }
* html #nav ul { margin: 0 0 0 -2px; }
.clearfix:after { content: "."; display: block; clear: both; visibility: hidden; line-height: 0; height: 0; }
.clearfix { display: inline-block; }
html[xmlns] .clearfix { display: block; }
* html .clearfix { height: 1%; }
</style>
</head>
<body>
<div class="wrap">
<ul id="nav">
<li><a href="#">网站主页</a></li>
<li><a href="#">关于我</a>
<ul>
<li><a href="#">Company</a></li>
<li><a href="#">Authors</a></li>
<li><a href="#">Advertising</a></li>
</ul>
</li>
<li><a href="#">RSS订阅</a>
<ul>
<li><a href="#">PSD</a></li>
<li><a href="#">Patterns</a></li>
<li><a href="#">Icons</a></li>
</ul>
</li>
<li><a href="#">精美博文</a>
<ul>
<li><a href="#">HTML5</a></li>
<li><a href="#">CSS3</a></li>
<li><a href="#">jQuery</a></li>
<li><a href="#">MySQL</a></li>
</ul>
</li>
<li><a href="#">Web工具</a>
<ul>
<li><a href="#">Performance</a></li>
<li><a href="#">CMS Plugins</a></li>
<li><a href="#">Cheat Sheets</a></li>
</ul>
</li>
<li><a href="#">Originals</a>
<ul>
<li><a href="#">Website Design</a></li>
<li><a href="#">Mobile</a></li>
</ul>
</li>
</ul>
</div>
<script type="text/javascript">
$(document).ready(function() {
$('#nav li').hover(function() {
$('ul', this).slideDown(200);
$(this).children('a:first').addClass("hov");
}, function() {
$('ul', this).slideUp(100);
$(this).children('a:first').removeClass("hov");
});
});
</script>
</body>
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希望本文所述对大家的jquery程序设计有所帮助。
