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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>
<div 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 div 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 div.</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>
</div>
</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>
</div>
</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>
</div>
</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>
</div>
</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>
</div>
</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>
</div>
</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>
</div>
</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>
</div>
</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>
</div>
</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>
<div 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>
</div>
</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>
<div 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>
</div>
</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;
}
div.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;
}
div.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>
<div 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>
</div>
</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>
<div 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>
</div>
</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>
<div class="dropdown">
<a href="#" class="dropbtn">下拉菜单</a>
<div class="dropdown-content">
<a href="#">链接 1</a>
<a href="#">链接 2</a>
<a href="#">链接 3</a>
</div>
</div>
</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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