请帮我看一下,为什么我的二级栏目不能出现在标题的下面

来源:4-2 侧边栏导航跟随案例

技术渣渣ss

2019-01-23 14:50

<body>   <div class="page">       <div class="nav">           <ul class="list1">               <li class="list1-Dem">标题                   <ul>                       <li>二级栏目                           <div class="list3">                               <ul>                                   <li>三级栏目</li>                                   <li>三级栏目</li>                                   <li>三级栏目</li>                                   <li>三级栏目</li>                               </ul>                           </div>                       </li>                       <li>二级栏目                               <div class="list3">                                       <ul>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                       </ul>                                   </div>                       </li>                       <li>二级栏目                               <div class="list3">                                       <ul>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                       </ul>                                   </div>                       </li>                   </ul>               </li>           </ul>           <ul class="list1">                   <li class="list1-Dem">标题                       <ul>                           <li>二级栏目                               <div class="list3">                                   <ul>                                       <li>三级栏目</li>                                       <li>三级栏目</li>                                       <li>三级栏目</li>                                       <li>三级栏目</li>                                   </ul>                               </div>                           </li>                           <li>二级栏目                                   <div class="list3">                                           <ul>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                           </ul>                                       </div>                           </li>                           <li>二级栏目                                   <div class="list3">                                           <ul>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                           </ul>                                       </div>                           </li>                       </ul>                   </li>               </ul>               <ul class="list1">                       <li class="list1-Dem">标题                           <ul>                               <li>二级栏目                                   <div class="list3">                                       <ul>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                           <li>三级栏目</li>                                       </ul>                                   </div>                               </li>                               <li>二级栏目                                       <div class="list3">                                               <ul>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                               </ul>                                           </div>                               </li>                               <li>二级栏目                                       <div class="list3">                                               <ul>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                               </ul>                                           </div>                               </li>                           </ul>                       </li>                   </ul>                   <ul class="list1">                           <li class="list1-Dem">标题                               <ul>                                   <li>二级栏目                                       <div class="list3">                                           <ul>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                               <li>三级栏目</li>                                           </ul>                                       </div>                                   </li>                                   <li>二级栏目                                           <div class="list3">                                                   <ul>                                                       <li>三级栏目</li>                                                       <li>三级栏目</li>                                                       <li>三级栏目</li>                                                       <li>三级栏目</li>                                                   </ul>                                               </div>                                   </li>                                   <li>二级栏目                                           <div class="list3">                                                   <ul>                                                       <li>三级栏目</li>                                                       <li>三级栏目</li>                                                       <li>三级栏目</li>                                                       <li>三级栏目</li>                                                   </ul>                                               </div>                                   </li>                               </ul>                           </li>                       </ul>                       <ul class="list1">                               <li class="list1-Dem">标题                                   <ul>                                       <li>二级栏目                                           <div class="list3">                                               <ul>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                                   <li>三级栏目</li>                                               </ul>                                           </div>                                       </li>                                       <li>二级栏目                                               <div class="list3">                                                       <ul>                                                           <li>三级栏目</li>                                                           <li>三级栏目</li>                                                           <li>三级栏目</li>                                                           <li>三级栏目</li>                                                       </ul>                                                   </div>                                       </li>                                       <li>二级栏目                                               <div class="list3">                                                       <ul>                                                           <li>三级栏目</li>                                                           <li>三级栏目</li>                                                           <li>三级栏目</li>                                                           <li>三级栏目</li>                                                       </ul>                                                   </div>                                       </li>                                   </ul>                               </li>                           </ul>       </div>   </div></body>
*{   margin: 0;   padding: 0;}.page{   width: 100%;   height: 10025px;   background: url("../img/tao.png") no-repeat center top;}.nav{   width: 160px;   height: auto;   background-color: coral;   position: fixed;   left: 1px;   top: 10%;   margin-top: 205px;   font-family: '微软雅黑';   text-align: center;}.list1{   width: 160px;   height: 40px;   list-style:none;   cursor: pointer;   padding: 2px;   margin: 1px;}.list1-Dem{   width: 160px;   height: auto;   color:#fff;   border-bottom: 1px solid #fff;   line-height: 40px;   font-size: 20px;   text-decoration: none;   display: inline-block;}.list1-Dem ul{   width: 160px;   height: auto;   display: none;   position: relative;   background-color: #ccc;   padding: 2px;   margin: 1px;}.list1-Dem ul li{   width: 160px;   height: 40px;   color: #fff;   font-size: 16px;   border-bottom: 1px dashed #000;   line-height: 40px;}.list1:hover .list1-Dem ul{   display: block;}.list3{   height: 40px;   width: 160px;   position: absolute;   left: 160px;   top: 0;   display: none;   padding: 2px;   margin: 1px;}.list3 ul {   width: 160px;   height: 40px;}.list3 ul li{   width: 160px;   height: 40px;   font-size: 16px;   line-height: 40px;   border-bottom: 1px solid #fff;   background-color: #666666;}.list1-Dem ul li:hover .list3{   display: block;}.list1-Dem:hover, .list1-Dem:active{   background-color: red;}.list1-Dem ul li:hover, .list1-Dem ul li:active{   background-color: red;}


写回答 关注

1回答

  • 某人心安
    2019-01-23 15:33:12

    没有设置元素的堆叠顺序

css定位 position

老师带你了解CSS中定位的知识,并运用到实际案例中。

49044 学习 · 92 问题

查看课程

相似问题