jQuery fade in, fade out, expand and shrink menu implementation code_jquery

Rendering:

After running, just refresh.

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>jQuery fade in and out, expand and shrink menu</title> <style type="text/css"> ul li{list-style:none;} ul li.menu{position:relative;width:120px;} ul li.menu ul{display:none;text-align:center;background:#fff;border:1px solid #ddd;width:100px;padding:5px;} ul li.menu ul li{padding:5px 0;border-bottom:1px dotted #ddd;}</style> <ul> <li class="menu"> <a> </a> <ul class="content">Popup menu<li> <a href="#"> </a> </li>Menu content 1<li><a href="#"> </a></li>Menu content 2<li><a href="#"> </a></li>Menu content 3<li><a href="#"> </a></li>Menu content 4<li><a href="#"> </a></li>Menu content 5</ul> </li> </ul>