大家都知道jQuery是一個框架，它對JS進行了封裝，使其更方便使用。前面兩篇博文分別是用CSS樣式和JS實現的，那么這篇就用jQuery來實現二級下拉式菜單。
使用JQuery實現需要用到的知識有：
第一種方法：將jQuery庫下載到電腦上，然后引用，我下載的是jquery-1.7.1.min.js這個版本。
例如：
<script type="text/javascript" src="jquery/jquery-1.7.1.min.js"></script>
第二種方法：直接引用在線服務器上的jQuery庫文件，比如谷歌服務器jQuery庫，百度服務器jQuery庫等。
例如：引用百度服務器上的jQuery庫文件
<script type="text/javascript" src="jquery/1.9.0/jquery.js"></script>
接下來看看制作的流程：
先來看看效果圖：
最后我們來看看代碼的情況，和前面的區別不大：
HTML代碼：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><htmlxmlns="http://www.w3.org/1999/xhtml"><head><metahttp-equiv="Content-Type"content="text/html; charset=gb2312" /><title>下拉菜單</title><linkrel="stylesheet"type="text/css"href="style.css" rel="external nofollow" /><!--引用百度服務器的jQuery庫--><scriptsrc="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script><scripttype="text/javascript"src="script.js"></script></head> <body><divid="nav"class="nav"> <ul> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >網站首頁</a></li> <liclass="navmenu"><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >課程大廳</a> <ul> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >JavaScript</a></li> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >jQuery</a></li> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Ajax</a></li> </ul> </li> <liclass="navmenu"><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >學習中心</a> <ul> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >視頻學習</a></li> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >案例學習</a></li> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >交流平臺</a></li> </ul> </li> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >經典案例</a></li> <li><ahref="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >關于我們</a></li> </ul></div></body></html>
CSS樣式表外部style.css文件代碼：
/*CSS全局設置*/*{ margin:0; padding:0;}.nav{ background-color:#EEEEEE; height:40px; width:450px; margin:0auto;}ul{ list-style:none;}ul li{ float:left; line-height:40px; text-align:center;}a{ text-decoration:none; color:#000000; display:block; width:90px; height:40px;}a:hover{ background-color:#666666; color:#FFFFFF;}ul li ul li{ float:none; background-color:#EEEEEE;}ul li ul{ display:none;}/*為了兼容IE7寫的CSS樣式，但是必須寫在a:hover前面*/ul li ul li a:link,ul li ul li a:visited{ background-color:#EEEEEE;}ul li ul li a:hover{ background-color:#009933;}JS腳本外部script,js文件代碼：
$(function(){ $(".navmenu").mouseover(function(){ $(this).children("ul").show(); }) $(".navmenu").mouseout(function(){ $(this).children("ul").hide(); })})以上所述是小編給大家介紹的jquery二級導航下拉菜單詳解整合，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對武林網網站的支持！
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