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CSS 导航栏

时间:2019-10-10 10:15:41来源:IT技术作者:seo实验室小编阅读:51次「手机版」
 

导航栏

垂直

水平

导航栏

 熟练使用导航栏,对于任何网站都非常重要。

 使用CSS你尅转换成好看的导航栏而不是枯燥的HTML菜单。

导航栏=链接列表

 作为标准的HTML基础一个导航栏是必须的。

 导航栏基本上是一个链接链接,所以使用<ul>和<li>元素非常有意义:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		
	</head>
	<body>
		<ul>
			<li><a href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		
		<p>注意:这里我们用 href="#"作为测试连接。但在一个真正的 web 站点上需要真实的 url。</p>
	</body>
</html>

 现在让我们从列表中删除边距和填充:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		
	</body>
</html>

例子解析:

  • list-style-type:none - 移除列表前小标志。一个导航栏并不需要列表标记
  • 移除浏览器的默认设置将边距和填充设置为0

垂直导航栏

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
				width:200px;
				background-color:#f1f1f1;
			}
			
			li a{
				display:block;
				color:#000;
				padding:8px 16px;
				text-decoration:none;
			}
			
			/*鼠标移动到选项上修改背景颜色*/
			li a:hover {
				background-color:#555;
				color:white;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		
		<p>背景颜色添加到链接中显示链接的区域</p>
		<p>注意,整个区域是可点击的链接,而不仅仅是文本。</p>
	</body>
</html>

示例说明:

  • display:block - 显示块元素的链接,让整体变为可点击链接区域(不只是文本),它允许我们指定宽度
  • width:60px - 块元素默认情况下是最大宽度。我们要指定一个60像素的宽度
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
				width:120px;
			}
			a:link,a:visited{
				display:block;
				font-weight:bold;
				color:#FFFFFF;
				background-color:#98bf21;
				width:120px;
				text-align:center;
				padding:4px;
				text-decoration:none;
				text-transform:uppercase;
				background-color:
			}
			
			a:hover,a:active {
				background-color:#7A991A;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
	</body>
</html>

注意: 请务必指定 <a>元素在垂直导航栏的的宽度。如果省略宽度,IE6可能产生意想不到的效果。

激活/当前导航条实例

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
				width:120px;
			}
			a:link,a:visited{
				display:block;
				font-weight:bold;
				color:#FFFFFF;
				background-color:#98bf21;
				width:120px;
				text-align:center;
				padding:4px;
				text-decoration:none;
				text-transform:uppercase;
				background-color:
			}
			
			a:hover,a:active {
				background-color:#7A991A;
			}
		</style>
	</head>
	<body>
		<h2>垂直导航条</h2>
		<p>在点击了选项后,我们可以添加 "active" 类来标准哪个选项被选中。</p>
		<ul>
			<li><a href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
	</body>
</html>

创建链接并添加边框

 可以在<li>or<a>上添加text-align:center样式来让链接居中;

 可以在border<ui>上添加border属性来让导航栏有边框,如果要在每个选项上添加边框,可以在每个<li>元素上添加border-bootom:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
				width:200px;
				border:1px solid #555;
				
			}
			li a{
				display:block;
				color:#FFFFFF;
				background-color:#98bf21;
				padding:8px 16px;
				text-decoration:none;
			}
			
			li {
				text-align:center;
				border-bottom:1px solid #555;
			}
			
			li a.active {
				background-color: #4CAF50;
				color: white;
			}

			li a:hover:not(.active) {
				background-color: #555;
				color: white;
			}
		</style>
	</head>
	<body>
		<h2>垂直导航条</h2>
		<p>以下实例让每个链接居中,并给每个列表选项添加边框。</p>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
	</body>
</html>

全屏高度的固定导航条

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			border {
				margin: 0px;
			}
			
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
				width:25%;
				background-color:#f1f1f1;
				position:fixed;
				height:100%;
				overflow:auto;
			}
			
			li a{
				display:block;
				color:#000;
				padding:8px 16px;
				text-decoration:none;
			}
			
			li a.active {
				background-color: #4CAF50;
				color: white;
			}

			li a:hover:not(.active) {
				background-color: #555;
				color: white;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		
		<p style="margin-left:25%;padding:1px 16px;height:1000px;">
	  <h2>Fixed Full-height Side Nav</h2>
	  <h3>Try to scroll this area, and see how the sidenav sticks to the page</h3>
	  <p>notice that this p element has a left margin of 25%. This is because the side navigation is set to 25% width. If you remove the margin, the sidenav will overlay/sit on top of this p.</p>
	  <p>Also notice that we have set overflow:auto to sidenav. This will add a scrollbar when the sidenav is too long (for example if it has over 50 links inside of it).</p>
	  <p>Some text..</p>
	  <p>Some text..</p>
	  <p>Some text..</p>
	  <p>Some text..</p>
	  <p>Some text..</p>
	  <p>Some text..</p>
	  <p>Some text..</p>
</p>
		
	</body>
</html>

水平导航栏

 有两种方法创建横向导航栏。使用内联或浮动的列表项

 这两种方法都很好,但如果你想链接到具有相同的大小,你必须使用浮动的方法。

内联列表项

 建立一个横向导航栏的方式之一是指定元素。上述代码是标准的内联:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul 
			{
				list-style-type:none;
				margin:0;
				padding:0;
			}
			
			li {
				display:inline;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		
</p>
		
	</body>
</html>
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			padding-top:6px;
			padding-bottom:6px;
		}
		li
		{
			display:inline;
		}
		a:link,a:visited
		{
			font-weight:bold;
			color:#FFFFFF;
			background-color:#98bf21;
			text-align:center;
			padding:6px;
			text-decoration:none;
			text-transform:uppercase;
		}
		a:hover,a:active
		{
			background-color:#7A991A;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		<p><b>注意:</b>如果您只为 a 元素设置内边距(而不设置 ul 元素),那么链接会出现在 ul 元素之外。所以,我们为 ul 元素添加了 top 和 bottom 内边距。 </p>
</p>
		
	</body>
</html>

浮动列表项

对于所有的链接宽度都相等,浮动<li>元素,并指定为<a>元素的宽度:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
		}
		li
		{
			float:left;
		}
		a
		{
			display:block;
			width:60px;
			background-color:#ddddd;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
		<p><b>注意:</b> 如果 !DOCTYPE 没有定义, floating 可以产生意想不到的结果.</p>
		<p>背景颜色添加到链接中显示链接的区域。整个链接区域是可点击的,不仅仅是文本。</p>	​
		<p><b>注意:</b> overflow:hidden 添加到 ul 元素,以防止 li 元素列表的外出。.</p>
</p>
		
	</body>
</html>

实例解析:

  • float:left - 使用浮动块元素的幻灯片彼此相邻
  • display:block - 显示块元素的链接,让整体变为可点击链接区域(不只是文本),它允许我们指定宽度
  • width:60px - 块元素默认情况下是最大宽度。我们要指定一个60像素的宽度
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
		}
		li
		{
			float:left;
		}
		a:link,a:visited
		{
			display:block;
			width:120px;
			font-weight:bold;
			color:#FFFFFF;
			background-color:#98bf21;
			text-align:center;
			padding:4px;
			text-decoration:none;
			text-transform:uppercase;
		}
		a:hover,a:active
		{
			background-color:#7A991A;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
</p>
		
	</body>
</html>

水平导航条实例

创建一个水平导航条,在鼠标移动到选项后修改背景颜色

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
			background-color:#333;
		}
		li
		{
			float:left;
		}
		li a
		{
			display:block;
			color:white;
			text-align:center;
			padding:14px 16px;
			text-decoration:none;
		}
		li a:hover
		{
			background-color:#111;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
</p>
		
	</body>
</html>

激活/当前导航条实例

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
			background-color:#333;
		}
		li
		{
			float:left;
		}
		li a
		{
			display:block;
			color:white;
			text-align:center;
			padding:14px 16px;
			text-decoration:none;
		}
		li a:hover:not(.active)
		{
			background-color:#111;
		}
		
		.active {
			background-color:#4CAF50;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li><a href="#about">关于</a></li>
		</ul>
</p>
		
	</body>
</html>

链接右对齐

将导航条信息最右边的选项设置右对齐(float:right):

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
			background-color:#333;
		}
		li
		{
			float:left;
		}
		li a
		{
			display:block;
			color:white;
			text-align:center;
			padding:14px 16px;
			text-decoration:none;
		}
		li a:hover:not(.active)
		{
			background-color:#111;
		}
		
		.active {
			background-color:#4CAF50;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li style="float:right"><a class="active" href="#about">关于</a></li>
		</ul>
</p>
		
	</body>
</html>

添加分割线

 <li>通过border-right 样式来添加分割线:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
		{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
			background-color:#333;
		}
		li
		{
			float:left;
			border-right:1px solid #bbb;
		}
		li:list-child{
			border-right:none;
		}
		li a
		{
			display:block;
			color:white;
			text-align:center;
			padding:14px 16px;
			text-decoration:none;
		}
		li a:hover:not(.active)
		{
			background-color:#111;
		}
		
		.active {
			background-color:#4CAF50;
		}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li style="float:right"><a  href="#about">关于</a></li>
		</ul>
</p>
		
	</body>
</html>

固定导航条

 可以设置页面的导航条固定在头部或者底部

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			body {margin:0;}
			ul
			{
				list-style-type:none;
				margin:0;
				padding:0;
				overflow:hidden;
				background-color:#333;
				position:fixed;
				top:0px;
				width:100%;
			}
			li
			{
				float:left;
				border-right:1px solid #bbb;
			}
			li:list-child{
				border-right:none;
			}
			li a
			{
				display:block;
				color:white;
				text-align:center;
				padding:14px 16px;
				text-decoration:none;
			}
			li a:hover:not(.active)
			{
				background-color:#111;
			}
			
			.active {
				background-color:#4CAF50;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li style="float:right"><a  href="#about">关于</a></li>
		</ul>
		
		<p style="padding:20px;margin-top:30px;background-color:#1abc9c;height:1500px;">
		<h1>Fixed Top Navigation Bar</h1>
		<h2>Scroll this page to see the effect</h2>
		<h2>The navigation bar will stay at the top of the page while scrolling</h2>

		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		</p>
		
	</body>
</html>
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			body {margin:0;}
			ul
			{
				list-style-type:none;
				margin:0;
				padding:0;
				overflow:hidden;
				background-color:#333;
				position:fixed;
				bottom:0px;
				width:100%;
			}
			li
			{
				float:left;
				border-right:1px solid #bbb;
			}
			li:list-child{
				border-right:none;
			}
			li a
			{
				display:block;
				color:white;
				text-align:center;
				padding:14px 16px;
				text-decoration:none;
			}
			li a:hover:not(.active)
			{
				background-color:#111;
			}
			
			.active {
				background-color:#4CAF50;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li style="float:right"><a  href="#about">关于</a></li>
		</ul>
		
		<p style="padding:20px;margin-top:30px;background-color:#1abc9c;height:1500px;">
		<h1>Fixed Top Navigation Bar</h1>
		<h2>Scroll this page to see the effect</h2>
		<h2>The navigation bar will stay at the top of the page while scrolling</h2>

		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		<p>Some text some text some text some text..</p>
		</p>
		
	</body>
</html>

灰色水平导航条

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul
			{
				list-style-type:none;
				margin:0;
				padding:0;
				overflow:hidden;
				border:1px solid #e7e7e7;
				background-color:#f3f3f3;
				
			}
			li
			{
				float:left;
				
			}
			li a
			{
				display:block;
				color:#666;
				text-align:center;
				padding:14px 16px;
				text-decoration:none;
			}
			li a:hover:not(.active)
			{
				background-color:#ddd;
			}
			
			li a.active {
				color:white;
				background-color:#4CAF50;
			}
		</style>
	</head>
	<body>
		<ul>
			<li><a class="active" href="#home">主页</a></li>
			<li><a href="#news">新闻</a></li>
			<li><a href="#contact">联系</a></li>
			<li style="float:right"><a  href="#about">关于</a></li>
		</ul>
		
	
	</body>
</html>

实例

响应式顶部导航

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			body {margin: 0;}

			ul.sidenav {
				list-style-type: none;
				margin: 0;
				padding: 0;
				width: 25%;
				background-color: #f1f1f1;
				position: fixed;
				height: 100%;
				overflow: auto;
			}

			ul.sidenav li a {
				display: block;
				color: #000;
				padding: 8px 16px;
				text-decoration: none;
			}
			 
			ul.sidenav li a.active {
				background-color: #4CAF50;
				color: white;
			}

			ul.sidenav li a:hover:not(.active) {
				background-color: #555;
				color: white;
			}

			p.content {
				margin-left: 25%;
				padding: 1px 16px;
				height: 1000px;
			}
			
			@media screen and (max-width: 900px) {
				ul.sidenav {
					width: 100%;
					height: auto;
					position: relative;
				}
				ul.sidenav li a {
					float: left;
					padding: 15px;
				}
				p.content {margin-left: 0;}
			}

			@media screen and (max-width: 400px) {
				ul.sidenav li a {
					text-align: center;
					float: none;
				}
			}

		</style>
	</head>
	<body>
		<ul class="sidenav">
		  <li><a class="active" href="#home">主页</a></li>
		  <li><a href="#news">新闻</a></li>
		  <li><a href="#contact">联系</a></li>
		  <li><a href="#about">关于</a></li>
		</ul>

		<p class="content">
		  <h2>响应式边栏导航实例</h2>
		  <p>该实例在屏幕宽度小于 900px 时导航栏为顶部水平导航栏,如果大于 900px 导航栏会在左边,且是固定的。</p>
		  <p>如果屏幕宽度小于 400px 会变为垂直导航栏。</p>
		  <h3>重置浏览器窗口大小,查看效果。</h3>
		</p>
	
	</body>
</html>

响应式边栏导航

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			body {margin: 0;}

		ul.topnav {
			list-style-type: none;
			margin: 0;
			padding: 0;
			overflow: hidden;
			background-color: #333;
		}

		ul.topnav li {float: left;}

		ul.topnav li a {
			display: block;
			color: white;
			text-align: center;
			padding: 14px 16px;
			text-decoration: none;
		}

		ul.topnav li a:hover:not(.active) {background-color: #111;}

		ul.topnav li a.active {background-color: #4CAF50;}

		ul.topnav li.right {float: right;}

		@media screen and (max-width: 600px){
			ul.topnav li.right, 
			ul.topnav li {float: none;}
		}

		</style>
	</head>
	<body>
		<ul class="topnav">
		  <li><a class="active" href="#home">主页</a></li>
		  <li><a href="#news">新闻</a></li>
		  <li><a href="#contact">联系</a></li>
		  <li class="right"><a href="#about">关于</a></li>
		</ul>

		<p style="padding:0 16px;">
		  <h2>响应式导航栏实例</h2>
		  <p>在屏幕宽度小于 600px 会重置导航栏。</p>
		  <h4>重置浏览器窗口大小,查看效果。</h4>
		</p>

	
	</body>
</html>

导航下拉菜单

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"> 
		<title>自学教程(如约智惠.com)</title> 
		<style>
			ul{
			list-style-type:none;
			margin:0;
			padding:0;
			overflow:hidden;
			background-color:#333;
		  }
		  
		  li{
			float:left;
		  }
		  
		  li a, .dropbtn
		  {
			display:inline-block;
			color:white;
			text-align:center;
			padding:14px 16px;
			text-decoration:none;
		  }
		  
		  li a:hover, .dropdown:hover, .dropbtn
		  {
			background-color:#111;
		  }
		  
		  .dropdown
		  {
			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);
		  }
		  
		  .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;
		  }
		</style>
	</head>
	<body>
		<ul>
  <li><a class="active" href="#home">主页</a></li>
  <li><a href="#news">新闻</a></li>
  <p class="dropdown">
    <a href="#" class="dropbtn">下拉菜单</a>
    <p class="dropdown-content">
      <a href="#">链接 1</a>
      <a href="#">链接 2</a>
      <a href="#">链接 3</a>
    </p>
  </p>
</ul>

<h3>导航栏上的下拉菜单</h3>
<p>鼠标移动到 "下拉菜单" 链接先显示下拉菜单。</p>

	
	</body>
</html>

参考:

https://www.yuque.com/docs/share/a39170cf-1a64-4c6d-b4aa-67b7bade3754

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