这是一款基于jquery实现的树形菜单代码，点击菜单项可以向下滑出对应的二级菜单，效果流畅自然。
先来看看运行效果截图：
在线演示地址如下：
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> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>jquery的树形菜单代码 </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="https://www.jb51.net/jquery1.3.2.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><span>全部收起/展开</span>树形菜单</h1> <div> <h1>一级菜单1</h1> <div> <h2><a href="javascript:function()">二级菜单1</a></h2> <ul> <li><a href="javascript:function()">·三级菜单1</a></li> <li><a href="javascript:function()">·三级菜单1</a></li> <li><a href="javascript:function()">·三级菜单1</a></li> <li><a href="javascript:function()">·三级菜单1</a></li> </ul> <h2><a href="javascript:function()">二级菜单2</a></h2> <ul> <li><a href="javascript:function()">·三级菜单2</a></li> <li><a href="javascript:function()">·三级菜单2</a></li> <li><a href="javascript:function()">·三级菜单2</a></li> <li><a href="javascript:function()">·三级菜单2</a></li> </ul> <h2><a href="javascript:function()">二级菜单3</a></h2> </div> <h1>一级菜单2</h1> <div> <h2><a href="javascript:function()">二级菜单2</a></h2> <h2><a href="javascript:function()">二级菜单2</a></h2> <h2><a href="javascript:function()">二级菜单2</a></h2> </div> <h1>一级菜单3</h1> <div> <h2><a href="javascript:function()">二级菜单3</a></h2> <h2><a href="javascript:function()">二级菜单3</a></h2> <h2><a href="javascript:function()">二级菜单3</a></h2> </div> </div> </body> </html>