這里介紹一款基于jquery實(shí)現(xiàn)的網(wǎng)站下拉菜單，黑色風(fēng)格，很漂亮，本菜單需要點(diǎn)擊主菜單后的小三角符號(hào)才下拉出二級(jí)菜單，并不是有些菜單，是鼠標(biāo)移上主菜單的時(shí)候就滑過(guò)，至于哪一種，就看個(gè)人的喜好了

先來(lái)看看運(yùn)行效果：

在線演示地址如下：

http://demo.jb51.net/js/2015/jquery-bg-2-level-down-show-menu-codes/

具體代碼如下：

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>jQuery二級(jí)菜單</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").click(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 type="text/css">
body {
 margin: 0; padding: 0;
 font: 10px normal Arial, Helvetica, sans-serif;
 background: #ddd url(images/body_bg.gif) repeat-x;
}
.container {
 width: 960px;
 margin: 0 auto;
 position: relative;
}
#header {
 padding-top: 120px;
}
#header .disclaimer {
 color: #999;
 padding: 100px 0 7px 0;
 text-align: right;
 display: block;
 position: absolute;
 top: 0; right: 0;
}
#header .disclaimer a { color: #ccc;}
ul.topnav {
 list-style: none;
 padding: 0 20px; 
 margin: 0;
 float: left;
 width: 920px;
 background: #222;
 font-size: 1.2em;
 background: url(images/topnav_bg.gif) repeat-x;
}
ul.topnav li {
 float: left;
 margin: 0; 
 padding: 0 15px 0 0;
 position: relative;
}
ul.topnav li a{
 padding: 10px 5px;
 color: #fff;
 display: block;
 text-decoration: none;
 float: left;
}
ul.topnav li a:hover{
 background: url(images/topnav_hover.gif) no-repeat center top;
}
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 {
 list-style: none;
 position: absolute;
 left: 0; top: 35px;
 background: #333;
 margin: 0; padding: 0;
 display: none;
 float: left;
 width: 170px;
 -moz-border-radius-bottomleft: 5px;
 -moz-border-radius-bottomright: 5px;
 -webkit-border-bottom-left-radius: 5px;
 -webkit-border-bottom-right-radius: 5px;
 border: 1px solid #111;
}
ul.topnav li ul.subnav li{
 margin: 0; padding: 0;
 border-top: 1px solid #252525;
 border-bottom: 1px solid #444;
 clear: both;
 width: 170px;
}
html ul.topnav li ul.subnav li a {
 float: left;
 width: 145px;
 background: #333 url(images/dropdown_linkbg.gif) no-repeat 10px center;
 padding-left: 20px;
}
html ul.topnav li ul.subnav li a:hover {
 background: #222 url(images/dropdown_linkbg.gif) no-repeat 10px center; 
}
#header img {
 margin: 20px 0 10px;
}
</style>
</head>
<body>
<div class="container">
 <div id="header">
 <ul class="topnav">
  <li><a href="#">網(wǎng)站首頁(yè)</a></li>
  <li>
  <a href="#">網(wǎng)頁(yè)菜單</a>
  <ul class="subnav">
   <li><a href="#">ASP導(dǎo)航</a></li>
   <li><a href="#">JSP導(dǎo)航</a></li>
   <li><a href="#">ASP.net導(dǎo)航</a></li>
   <li><a href="#">PHP導(dǎo)航</a></li>
  </ul>
  </li>
  <li>
  <a href="#">網(wǎng)頁(yè)特效</a>
  <ul class="subnav">
   <li><a href="#">層和菜單</a></li>
   <li><a href="#">鼠標(biāo)特效</a></li>
   <li><a href="#">表單特效</a></li>
   <li><a href="#">表格特效</a></li>
   <li><a href="#">CSS特效</a></li>
   <li><a href="#">jQuery特效</a></li>
  </ul>
  </li>
  <li><a href="#">搜索引擎</a></li>
  <li><a href="#">博客營(yíng)銷</a></li>
  <li><a href="#">聯(lián)系我們</a></li>
 </ul>
 </div>
</div>
</body>
</html>

希望本文所述對(duì)大家的jquery程序設(shè)計(jì)有所幫助。

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