<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1.0, user-scalable=0">
<title>Document</title>
<style type="text/css">
* { margin: 0; padding: 0; }
.tree {margin: 0;padding: 0;background-color:#f2f2f2;overflow: hidden;}
/*隐藏input*/
.tree li input{position: absolute;left: 0;opacity: 0;z-index: 2;cursor: pointer;height: 1em;width:1em;top: 0;}
/*所有菜单项设置统一样式*/
.tree li {position: relative;list-style: none;}
/*一级菜单加下边线*/
.tree>li{border-bottom: 1px solid #d9d9d9;}
/*给有子菜单的菜单项添加背景图标*/
.tree li label {max-width:999px;cursor: pointer;display: block;margin:0 0 0 -50px;padding: 15px 10px 15px 70px;white-space:nowrap;overflow:hidden;text-overflow: ellipsis; }
.tree li label:hover,li label:focus{background-color:#a7a7a7;color:#fff;}
/*清除所有展开的子菜单的display*/
.tree li input + ol{display: none;}
/*当input被选中时，给所有展开的子菜单设置样式*/
.tree input:checked + ol {padding-left:14px;height: auto;display: block;}
.tree input:checked + ol > li { height: auto;}
/*末层菜单为A标签，设置样式*/
.tree li.file a{margin:0 -10px 0 -50px;padding: 15px 20px 15px 70px;text-decoration:none;display: block;color:#333333;white-space:nowrap;overflow:hidden;text-overflow: ellipsis;}
.tree li.file a:hover,li.file a:focus{background-color:#a7a7a7;color:#fff;}
/*不同层级的菜单字体大小不同*/
.tree .folderOne{font-size: 18px;}
.tree .folderTwo{font-size:16px;}
.tree .folderThree{font-size:14px;}
</style>
</head>
<body>
<ol class="tree">
<li>
<label for="folder1" class="folderOne">泽元框架</label> <input type="checkbox" id="folder1" />
<ol>
<li>
<label for="subfolder1"class="folderTwo">开发规范</label> <input type="checkbox" id="subfolder1" />
<ol>
<li class="file folderThree"><a href="#">常见界面错误举例</a></li>
<li class="file folderThree"><a href="#">关于发行报告对BUG管理提出…</a></li>
<li class="file folderThree"><a href="#">插件内部JAVA包命名规范</a></li>
</ol>
</li>
<li class="file folderTwo"><a href="#">概述</a></li>
<li class="file folderTwo"><a href="#">服务器集群</a></li>
<li class="file folderTwo"><a href="#">模板</a></li>
<li class="file folderTwo"><a href="#">安全机制</a></li>
</ol>
</li>
<li>
<label for="folder2" class="folderOne" >ZCMS</label> <input type="checkbox" id="folder2" />
<ol>
<li class="file folderTwo"><a href="#">实时数据</a></li>
<li>
<label for="subfolder2" class="folderTwo">实时数据</label> <input type="checkbox" id="subfolder2" />
<ol>
<li class="file folderThree"><a href="#">实时数据</a></li>
<li class="file folderThree"><a href="#">实时数据</a></li>
<li class="file folderThree"><a href="#">实时数据</a></li>
</ol>
</li>
</ol>
</li>
<li>
<label for="folder3" class="folderOne">ZAS</label> <input type="checkbox" id="folder3" />
<ol>
<li class="file folderTwo"><a href="#">实时数据</a></li>
<li class="file folderTwo"><a href="#">实时数据</a></li>
</ol>
</li>
<li>
<label for="folder4" class="folderOne">ZHTML标签</label> <input type="checkbox" id="folder4"/>
<ol>
<li class="file folderTwo"><a href="#">实时数据</a></li>
<li class="file folderTwo"><a href="#">实时数据</a></li>
</ol>
</li>
<li>
<label for="folder5" class="folderOne">UI框架API手册</label> <input type="checkbox" id="folder5"/>
<ol>
<li class="file folderTwo"><a href="#">实时数据</a></li>
<li class="file folderTwo"><a href="#">实时数据</a></li>
</ol>
</li>
</ol>
</body>
</html>
效果展示： 