您可以使用Bootstrap导航栏组件为您的网站或应用程序创建响应式导航标题。这些响应式导航栏最初在具有小视口的设备（如手机）上折叠，但在用户单击切换按钮时会展开。但是，在笔记本电脑或台式机等中型和大型设备上，它将像往常一样是水平的。
导航栏一般放在页面的顶部。
我们可以使用 .navbar 类来创建一个标准的导航栏，后面紧跟: .navbar-expand-xl|lg|md|sm 类来创建响应式的导航栏 (大屏幕水平铺开，小屏幕垂直堆叠)。
导航栏上的选项可以使用 <ul> 元素并添加 类。 然后在 <li> 元素上添加 .nav-item 类， <a> 元素上使用 .nav-link 类:
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-light"> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 2</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 3</a> </li> </ul> </nav> <br> <div class="container-fluid"> <h2>简单的导航栏示例</h2> <p>导航栏一般放在页面的顶部。</p> <p>我们可以使用 .navbar 类来创建一个标准的导航栏，后面紧跟: .navbar-expand-xl|lg|md|sm 类来创建响应式的导航栏 (大屏幕水平铺开，小屏幕垂直堆叠)。</p> </div> </body> </html>测试看看 ‹/›
通过删除 .navbar-expand-xl|lg|md|sm 类来创建垂直导航栏:
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar bg-light"> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 2</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 3</a> </li> </ul> </nav> <br> <div class="container-fluid"> <h2>垂直导航栏</h2> <p>导航栏一般在页面头部。</p> </div> </body> </html>测试看看 ‹/›
可以使用以下类来创建不同颜色导航栏：.bg-primary, .bg-success, .bg-info, .bg-warning, .bg-danger, .bg-secondary, .bg-dark 和 .bg-light)。
提示: 对于暗色背景需要设置文本颜色为浅色的，对于浅色背景需要设置文本颜色为深色的。
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>不同颜色导航栏</h2> <p>对于暗色背景需要设置文本颜色为浅色的，对于浅色背景需要设置文本颜色为深色的。</p> </div> <nav class="navbar navbar-expand-sm bg-light navbar-light"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-primary navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-success navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-info navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-warning navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-danger navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> <nav class="navbar navbar-expand-sm bg-secondary navbar-dark"> <ul class="navbar-nav"> <li class="nav-item active"> <a class="nav-link" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> </nav> </body> </html>测试看看 ‹/›
激活和禁用状态: 可以在 <a> 元素上添加 .active 类来高亮显示选中的选项。 .disabled 类用于设置该链接是不可点击的。
.navbar-brand 类用于高亮显示品牌/Logo:
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <!-- Brand/logo --> <a class="navbar-brand" href="#">Logo</a> <!-- Links --> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 2</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 3</a> </li> </ul> </nav> <div class="container-fluid"> <h2>品牌/Logo</h2> <p>.navbar-brand 类用于高亮显示品牌/Logo:</p> </div> </body> </html>测试看看 ‹/›
如果使用图片，可以使用 .navbar-brand 类来设置图片自适应导航栏。
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <!-- Brand/logo --> <a class="navbar-brand" href="#"> <img src="https://static.(528045.com)/images/mix/bird.jpg" alt="logo" style="width:40px;"> </a> <!-- Links --> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 2</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 3</a> </li> </ul> </nav> <div class="container-fluid"> <h2>品牌 / Logo</h2> <p>果使用图片，可以使用 .navbar-brand 类来设置图片自适应导航栏。</p> </div> </body> </html>测试看看 ‹/›
通常，小屏幕上我们都会折叠导航栏，通过点击来显示导航选项。
要创建折叠导航栏，可以在按钮上添加, data-toggle="collapse" 与 data-target="#thetarget" 类。然后在设置了 类的 div 上包裹导航内容（链接）, div 元素上的 id 匹配按钮 data-target 的上指定的 id:
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-md bg-dark navbar-dark"> <a class="navbar-brand" href="#">Navbar</a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="collapsibleNavbar"> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> </ul> </div> </nav> <br> <div class="container"> <h2>折叠导航栏</h2> <p>通常，小屏幕上我们都会折叠导航栏，通过点击来显示导航选项。</p> <p>提示: 如果你删除 .navbar-expand-md 类，导航链接会一直隐藏，且切换按钮会一直显示。</p> </div> </body> </html>测试看看 ‹/›
导航栏上可以设置下拉菜单：
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <!-- Brand --> <a class="navbar-brand" href="#">Logo</a> <!-- Links --> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 2</a> </li> <!-- Dropdown --> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown"> Dropdown link </a> <div class="dropdown-menu"> <a class="dropdown-item" href="#">Link 1</a> <a class="dropdown-item" href="#">Link 2</a> <a class="dropdown-item" href="#">Link 3</a> </div> </li> </ul> </nav> <br> <div class="container"> <h2>导航栏使用下拉菜单</h2> <p>导航栏上可以设置下拉菜单。</p> </div> </body> </html>测试看看 ‹/›
导航栏的表单 <form> 元素使用 类来排版输入框与按钮：
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <form class="form-inline"> <input class="form-control" type="text" placeholder="Search"> <button class="btn btn-success" type="button">Search</button> </form> </nav> <br> <div class="container"> <h2>导航栏的表单</h2> <p>导航栏的表单 form 元素使用 class="form-inline" 类来排版输入框与按钮：</p> </div> </body> </html>测试看看 ‹/›
你也可以使用其他的输入框类，如 .input-group-addon 类用于在输入框前添加小标签。
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <form class="form-inline"> <div class="input-group"> <span class="input-group-addon">@</span> <input type="text" class="form-control" placeholder="Username"> </div> </form> </nav> <br> <div class="container"> <h2>导航表单</h2> <p> .input-group-addon 类用于在输入框前添加小标签。</p> </div> </body> </html>测试看看 ‹/›
使用 .navbar-text 类来设置导航栏上非链接文本，可以保证水平对齐，颜色与内边距一样。
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-expand-sm bg-dark navbar-dark"> <!-- Links --> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link 2</a> </li> </ul> <!-- Navbar text--> <span class="navbar-text"> Navbar text </span> </nav> <br> <div class="container"> <h2>导航栏文本</h2> <p>使用 .navbar-text 类来设置导航栏上非链接文本，可以保证水平对齐，颜色与内边距一样。</p> </div> </body> </html>测试看看 ‹/›
导航栏可以固定在头部或者底部。
我们使用 .fixed-top 类来实现导航栏的固定：
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body style="height:1500px"> <nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top"> <a class="navbar-brand" href="#">Logo</a> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> </ul> </nav> <div class="container-fluid" style="margin-top:80px"> <h2>固定导航栏</h2> <p>导航栏可以固定在头部或者底部。</p> <h1>滚动页面查看效果。</h1> </div> </body> </html>测试看看 ‹/›
.fixed-bottom 类用于设置导航栏固定在底部：
<!DOCTYPE html> <html> <head> <title>Bootstrap 示例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body style="height:1500px"> <nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-bottom"> <a class="navbar-brand" href="#">Logo</a> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="javascript:void(0)">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="javascript:void(0)">Link</a> </li> </ul> </nav> <div class="container-fluid"> <h2>底部固定导航栏</h2> <p>导航栏可以固定在头部或者底部。</p> <h1>滚动页面查看效果。</h1> </div> </body> </html>测试看看 ‹/›