一款可以折叠、展开全部的树形菜单，基于jQuery插件实现，这是一个三级的目录树导航，如果手动点击的话是不能完全展开的，有点类似于我们前边提到的手风琴菜单，总是展开其中一个模块，话多了，您自己看效果吧！网——您身边的建站好友！
为解决一些网页特效运行后不能显示效果（例如：jQuery则需要刷新）问题，特别新增网页版演示。
点击查看：网页特效
运行演示：
<!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=gbk" /><title>jquery三级树形菜单，树状菜单，也叫目录树！</title><style>body { font-family:"宋体"; font-size: 12px; line-height: 1.5em; color:#7FB0C8; padding:0; margin:0; background: #336699;}ul,ol,li,dl,dt,dd { margin:0; padding:0; list-style-type:none;}h1,h2,h3,form,input,iframe,span { margin:0; padding:0;}a { color:#7FB0C8;}a:link {color: #7FB0C8; TEXT-DECORATION: none;}a:visited {color: #7FB0C8; TEXT-DECORATION: none;}a:hover {color: #fff; TEXT-DECORATION: none;}.white { color:#fff;}.white a:link {color: #fff; TEXT-DECORATION: none;}.white a:visited {color: #fff; TEXT-DECORATION: none;}.white a:hover {color: #73E1F5; TEXT-DECORATION: none;}/* 树形菜单开始 */.close { float:right; clear:right; font-size:12px; font-weight:normal; cursor:pointer; padding-right:10px;}.title { font-size:14px; color:#fff; margin-bottom:10px; padding-left:5px; width:290px;}.menu { width:290px; height:330px; overflow-y:auto; overflow-x:hidden; margin-bottom:10px;}.menu { SCROLLBAR-FACE-COLOR: #002537; SCROLLBAR-HIGHLIGHT-COLOR: #002537; SCROLLBAR-SHADOW-COLOR: #0E6893; SCROLLBAR-3DLIGHT-COLOR: #0E6893; SCROLLBAR-ARROW-COLOR: #fff; SCROLLBAR-TRACK-COLOR: #053d58;SCROLLBAR-DARKSHADOW-COLOR: #002537; SCROLLBAR-BASE-COLOR: #01152a;}.l1 { background:#000; font-size:13px; padding:5px 0 0 30px; height:20px; margin-bottom:5px; cursor:pointer;}.slist { margin:0 0 5px 0; display:none;}.l2 { padding:0 0 0 35px; font-size:13px;}.l2 a { padding:6px 0 0 5px; width:230px; height:21px; display:block;}.currentl2 a,.l2 a:hover { background:#1E5A82; color:#fff;}.sslist { background:#156890; width:235px; overflow:hidden; margin:0 0 5px 35px; display:none;}.l3 a { padding:6px 0 0 5px; width:230px; height:20px; display:block;}.currentl3 a,.l3 a:hover { color:#fff; font-weight:bold;}</style><script type="text/javascript" src="/uploads/common/js/jquery-1.4.2.min.js"></script><script>// 树状菜单$(document).ready(function(){$(".l1").toggle(function(){$(".slist").animate({height: 'toggle', opacity: 'hide'}, "slow");$(this).next(".slist").animate({height: 'toggle', opacity: 'toggle'}, "slow");},function(){$(".slist").animate({height: 'toggle', opacity: 'hide'}, "slow");$(this).next(".slist").animate({height: 'toggle', opacity: 'toggle'}, "slow");});$(".l2").toggle(function(){$(this).next(".sslist").animate({height: 'toggle', opacity: 'toggle'}, "slow");},function(){$(this).next(".sslist").animate({height: 'toggle', opacity: 'toggle'}, "slow");});$(".l2").click(function(){$(".l3").removeClass("currentl3");$(".l2").removeClass("currentl2");$(this).addClass("currentl2");});$(".l3").click(function(){$(".l3").removeClass("currentl3");$(this).addClass("currentl3");});$(".close").toggle(function(){$(".slist").animate({height: 'toggle', opacity: 'hide'}, "fast");$(".sslist").animate({height: 'toggle', opacity: 'hide'}, "fast");},function(){$(".slist").animate({height: 'toggle', opacity: 'show'}, "fast");$(".sslist").animate({height: 'toggle', opacity: 'show'}, "fast");});});</script></head><body><h1 class="title"><span class="close">全部收起/展开</span>树形菜单</h1><div class="menu"><h1 class="l1">一级菜单</h1><div class="slist"><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2><ul class="sslist"><li class="l3"><a href="javascript:function()">·三级菜单</a></li><li class="l3"><a href="javascript:function()">·三级菜单</a></li><li class="l3"><a href="javascript:function()">·三级菜单</a></li><li class="l3"><a href="javascript:function()">·三级菜单</a></li></ul><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2><ul class="sslist"><li class="l3"><a href="javascript:function()">·三级菜单</a></li><li class="l3"><a href="javascript:function()">·三级菜单</a></li><li class="l3"><a href="javascript:function()">·三级菜单</a></li><li class="l3"><a href="javascript:function()">·三级菜单</a></li></ul><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2></div><h1 class="l1">一级菜单</h1><div class="slist"><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2></div><h1 class="l1">一级菜单</h1><div class="slist"><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2><h2 class="l2"><a href="javascript:function()">二级菜单</a></h2></div></div></body></html><div style="text-align:center;margin:30px 0 0 0;"><hr style="color:#999;height:1px;">如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.wfuyu.com/' target='_blank'>http://www.wfuyu.com/</a></div>提示：可修改后代码再运行!
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