CSS学习笔记之中级教程（三）-优快云博客

本文链接：https://blog.youkuaiyun.com/wz_1992/article/details/138910082

14、`CSS` 下拉菜单

14.1 示例1：普通弹窗

思路：弹窗内容先隐藏display: none;，:hover时候修改弹窗部分的 display: block;

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="css/baseStyle.css">
  <style>
    div.dropdown {
     
     
      position: relative;
      display: inline-block;
    }

    div.dropdown:hover .dropdown-content{
     
     
      display: block;
    }

    div.dropdown-content {
     
     
      display: none;
      position: absolute;
      background-color: red;
      min-width: 160px;
      border: 2px solid #666;
      padding: 12px 15px;
      z-index: 1;
    }
  </style>
</head>

<body>
  <h1>可悬停的下拉菜单</h1>
  <div class="dropdown">
    <p>把鼠标移动到下面文本上查看</p>
    <div class="dropdown-content">
      <p>Hello World</p>
    </div>
  </div>
</body>

</html>

鼠标悬停到p元素上后效果：
在这里插入图片描述

14.2 示例2：列表弹窗

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="css/baseStyle.css">
  <style>
    .button {
     
     
      display: inline;
      background-color: #4CAF50;
      padding: 10px 15px;
      font-size: 15px;
      color: white;
      border: none;
      margin-top: 10px;
      margin-bottom: 10px;
    }

    .dropdown-content{
     
     
      display: none;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      padding: 10px 15px;
      /* display: block; */
      min-width: 160px;
      background-color: #EDEDED;
      position: absolute;
    }

    .dropdown:hover .dropdown-content{
     
     
      display: block;
    }
  </style>
</head>

<body>
  <div>
    <h1>下拉菜单</h1>
    <p>把鼠标移动到按钮上，以打开下拉菜单</p>
    <div class="dropdown">
      <button class="button">dropdown</button>
      <div class="dropdown-content">
        <ul>
          <li>第一个</li>
          <li>第二个</li>
          <li>第三个</li>
        </ul>
      </div>
    </div>
    <p><b>Note:</b> 其他内容</p>
  </div>
</body>

</html>

运行效果：
在这里插入图片描述

14.3 示例3：下拉式图像

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="css/baseStyle.css">
  <style>
    .dropdown:hover .dropdown-content {
     
     
      display: block;
    }

    .dropdown-content {
     
     
      display: none;
    }
  </style>
</head>

<body>
  <div>
    <h1>下拉图片</h1>
    <p>把鼠标移动到图像上，以打开下拉内容</p>
    <div class="dropdown">
      <img src="imgs/icon_mess_sellorder.png" alt="pic" width="100px">
      <div class="dropdown-content">
        <img src="imgs/icon_mess_sellorder.png" alt="pic" width="300px">
      </div>
    </div>
    <p><b>Note:</b> 其他内容</p>
  </div>
</body>

</html>

运行效果：
在这里插入图片描述

14.4 示例4：下拉式导航

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="css/baseStyle.css">
  <style>
    ul {