本文实例讲述了jQuery实现向下滑出的平滑下拉菜单效果。分享给大家供大家参考。具体如下：
这里演示的jQuery向下滑出的下拉平滑菜单，可添加多个菜单选项，修改起来比较灵活的下滑菜单，颜色风格自己可修改，不多介绍了，感兴趣的运行一下代码看效果。
运行效果截图如下：
在线演示地址如下：
http://demo.VeVB.COm/js/2015/jquery-xlph-menu-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>jquery缓冲下拉导航菜单特效</title><script type="text/javascript" src="jquery-1.6.2.min.js"></script><script type="text/javascript">$(document).ready(function(){ $("ul.subnav").parent().append("<span></span>"); $("ul.topnav li span").mouseover(function() { $(this).parent().find("ul.subnav").slideDown('fast').show(); $(this).parent().hover(function() { }, function(){ $(this).parent().find("ul.subnav").slideUp('slow'); }); }).hover(function() { $(this).addClass("subhover"); }, function(){ $(this).removeClass("subhover"); });});</script><style>body,form,ul{margin:0px; padding:0px;}body{font-size:12px;}.clear{clear:both}div.examples_body {width: 750px;margin: 50px auto;}h2.title_name { font-family: normal Georgia,'Times New Roman',Times,serif; font-weight: normal; font-size: 4em; padding: 50px 0 20px 0; text-align: center;}h2.title_name span { font-family: normal Georgia,'Times New Roman',Times,serif; color: #AAA; font-size: 0.9em;}h2.title_name small { color: #AAAAAA; display: block; font-family: normal Verdana,Arial,Helvetica,sans-serif; font-size: 0.2em; letter-spacing: 1.0em; text-transform: uppercase;}div.examples_body h3 { color: #555; font-size: 130%; padding-bottom: 15px; margin-bottom: 15px;}p.demo_btn { width: 750px; margin: 30px auto; font-size: 0; text-indent: -9999px; clear: both; overflow: hidden;}p.demo_btn a { width: 160px; height: 41px; float: right;background: url(images/Download_Button.gif) no-repeat;}p.demo_btn a:hover {background: url(images/Download_Button_o.gif) no-repeat;}div.examples_body_wrap h3 {color: #f9f66d; font-size: 130%; padding-bottom: 15px; margin-bottom: 15px; background: url(images/solid-line-news.gif) repeat-x bottom;}div.examples_body_wrap {width: 750px;margin: 50px auto 0 auto;clear: both;}ul.topnav {width: 710px;float: left;background: #222;background: url(images/topnav_bg.gif) repeat-x;}ul.topnav li {float: left;margin: 0;padding: 0 10px 0 15px;position: relative;display: inline;}ul.topnav li a { padding: 10px 5px;color: #fff;display: block;text-decoration: none;float: left;}ul.topnav li a:hover {-moz-border-radius: 3px;-khtml-border-radius: 3px;-webkit-border-radius: 3px;}ul.topnav li span {width: 17px;height: 35px;float: left;background: url(images/subnav_btn.gif) no-repeat center top;}ul.topnav li span.subhover { background-position: center bottom; cursor: pointer;} ul.topnav li ul.subnav {width: 170px;position: absolute;left: 0; top: 35px;background: #333;margin: 0; padding: 0;display: none;float: left;border: 1px solid #111;}ul.topnav li ul.subnav li{width: 170px;margin: 0; padding: 0;border-top: 1px solid #252525;border-bottom: 1px solid #444;clear: both;}html ul.topnav li ul.subnav li a { width: 145px; float: left; background-color: #333; padding-left: 20px; font-size: 0.9em;}html ul.topnav li ul.subnav li a:hover { background-color: #222;}</style></head><body><div class="examples_body"> <ul class="topnav"> <li><a href="#">下拉菜单0</a></li> <li> <a href="#">下拉菜单1</a> <ul class="subnav"> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> </ul> </li> <li> <a href="#">下拉菜单2</a> <ul class="subnav"> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> </ul> </li> <li><a href="#">下拉菜单3</a> <ul class="subnav"> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> <li><a href="#">下拉子菜单</a></li> </ul> </li> <li><a href="#">下拉菜单4</a></li> <li><a href="#">下拉菜单5</a></li> </ul><!-- Examples body --></div><div class="clear"></div></body></html>希望本文所述对大家的jquery程序设计有所帮助。
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