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How to implement drop-down tab using native js

王林forward: 2020-04-27 09:13:082180browse

Let’s take a look at the implementation first:

How to implement drop-down tab using native js

The code is as follows:

<!DOCTYPE html>
<html>
 <head>
 <meta charset="utf-8" />
 <title>下拉选项卡</title>
 <style>
 *{
 padding: 0px;
 margin: 0px;
 font-family: "微软雅黑";
 font-size: 12px;
 }
 ul{
 list-style: none;
 }
 .head{
 width: 1000px;
 height: 50px;
 margin: 0px auto;
 background-color: greenyellow;
 }
 .head>ul{
 display: block;
 }
 .head>ul>li{
 float: left;
 width: 200px;
 text-align: center;
 height: 50px;
 line-height: 50px;
 font-size: 15px;
 }
 .head>ul>li:hover{
 background-color: green;
 }
 .head>ul>li:hover>ul{
 display: block;
 }
 .head>ul>li>ul{
 display: none;
 position: absolute;
 }
 .head>ul>li>ul>li{
 height: 40px;
 width: 200px;
 text-align: center;
 line-height: 40px;
 font-size: 15px;
 background-color: greenyellow;
 margin-top: 5px;
 }
 .head>ul>li>ul>li:hover{
 background-color: green;
 }
 </style>
 </head>
 <body>
 <div class="head">
 <ul>
 <li>
 院系
 <ul>
 <li>计科系</li>
 <li>电气系</li>
 <li>食品系</li>
 <li>机械系</li>
 </ul>
 </li>
 <li>
 学科
 <ul>
 <li>无线传感网</li>
 <li>计算机组成原理</li>
 <li>java程序设计</li>
 <li>c语言</li>
 </ul>
 </li>
 <li>
 专业
 <ul>
 <li>物联网工程</li>
 <li>软件工程</li>
 <li>计算机应用</li>
 <li>计算机科学</li>
 </ul>
 </li>
 <li>
 实验室
 <ul>
 <li>物联网实验室</li>
 <li>嵌入实验室</li>
 <li>软件工程实验室</li>
 <li>扮客人才孵化基地</li>
 </ul>
 </li>
 <li>
 宿舍
 <ul>
 <li>617宿舍</li>
 <li>618宿舍</li>
 <li>619宿舍</li>
 <li>620宿舍</li>
 </ul>
 </li>
 </ul>
 </div>
 </body>
</html>

How to implement drop-down tab using native js

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