CSS 下拉菜单

编程知识行业动态更新时间:2024-06-13 00:19:44

1、基本下拉菜单

当鼠标移动到指定元素上时，会出现下拉菜单。

<!DOCTYPE html>
<html>
<head>
  <title>下拉菜单实例|菜鸟教程(runoob)</title>
  <meta charset="utf-8">
  <style>
  .dropdown {
      position: relative;
      display: inline-block;
  }
  .dropdown-content {
      display: none;
      position: absolute;
      background-color: #f9f9f9;
      min-width: 160px;
      box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
      padding: 12px 16px;
  }
  .dropdown:hover .dropdown-content {
      display: block;
  }
  </style>
</head>
<body>
<h2>鼠标移动后出现下拉菜单</h2>
<p>将鼠标移动到指定元素上就能看到下拉菜单。</p>
<div class="dropdown">
  <span>鼠标移动到我这！</span>
  <div class="dropdown-content">
    <p>菜鸟教程</p>
    <p>www.runoob</p>
  </div>
</div>
</body>
</html>

2、下拉菜单

创建下拉菜单，并允许用户选取列表中的某一项：这个实例类似前面的实例，当我们在下拉列表中添加了链接，并设置了样式：

<!DOCTYPE html>
<html>
<head>
<title>下拉菜单实例|菜鸟教程(runoob)</title>
<meta charset="utf-8">
<style>
.dropdown {
    position: relative;
    display: inline-block;
}
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
    display: block;
}
.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>下拉菜单</h2>
<p>鼠标移动到按钮上打开下拉菜单。</p>
<div class="dropdown">
  <button class="dropbtn">下拉菜单</button>
  <div class="dropdown-content">
    <a href="http://www.runoob">菜鸟教程 1</a>
    <a href="http://www.runoob">菜鸟教程 2</a>
    <a href="http://www.runoob">菜鸟教程 3</a>
  </div>
</div>
</body>
</html>

3、下拉内容对齐方式

如果你想设置右浮动的下拉菜单内容方向是从右到左，而不是从左到右，可以添加以下代码 right: 0;

<!DOCTYPE html>
<html>
<head>
<title>下拉菜单实例|菜鸟教程(runoob)</title>
<meta charset="utf-8">
<style>
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}
 
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
    display: block;
}
.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>下拉内容的对齐方式</h2>
<p>left 和 right 属性指定了下拉内容是从左到右或从右到左。</p>
<div class="dropdown" style="float:left;">
  <button class="dropbtn">左</button>
  <div class="dropdown-content" style="left:0;">
    <a href="#">菜鸟教程 1</a>
    <a href="#">菜鸟教程 2</a>
    <a href="#">菜鸟教程 3</a>
  </div>
</div>
<div class="dropdown" style="float:left;">
  <button class="dropbtn">右</button>
  <div class="dropdown-content"  style="left:0;">
    <a href="#">菜鸟教程 1</a>
    <a href="#">菜鸟教程 2</a>
    <a href="#">菜鸟教程 3</a>
  </div>
</div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>下拉菜单实例|菜鸟教程(runoob)</title>
<meta charset="utf-8">
<style>
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
    display: block;
}
.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
</style>
</head>
<body>
<h2>下拉内容的对齐方式</h2>
<p>left 和 right 属性指定了下拉内容是从左到右或从右到左。</p>
<div class="dropdown" style="float:left;">
  <button class="dropbtn">左</button>
  <div class="dropdown-content" style="left:0;">
    <a href="#">菜鸟教程 1</a>
    <a href="#">菜鸟教程 2</a>
    <a href="#">菜鸟教程 3</a>
  </div>
</div>
<div class="dropdown" style="float:right;">
  <button class="dropbtn">右</button>
  <div class="dropdown-content">
    <a href="#">菜鸟教程 1</a>
    <a href="#">菜鸟教程 2</a>
    <a href="#">菜鸟教程 3</a>
  </div>
</div>
</body>
</html>

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CSS 下拉菜单

本文发布于:2023-03-28 18:31:00，感谢您对本站的认可！

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