如何在 Bootstrap 中显示黑色导航栏?
在本文中,我们将学习如何使用各种 Bootstrap 类(如“navbar-dark”或“bg-dark”)在 Bootstrap 中显示黑色导航栏。
导航栏在网站中非常有用,因为它们可以更轻松地导航到平台上的主要内容,提高整个网站的可访问性,并总体上增强用户体验。
在这里,我们将使用 Bootstrap 及其类创建一个黑色导航栏。我们将在下面的示例中使用 Bootstrap CDN 将 Bootstrap 导入到我们的项目中。
让我们通过一些示例来理解这一点 -
示例 1
在此示例中,我们将使用 Bootstrap 创建一个基本的导航栏,并使用“navbar-dark”和“bg-dark”类使其颜色变为黑色。
<html lang="en"> <head> <title>How to display black navigation bar in Bootstrap?</title> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <h3>How to display black navigation bar in Bootstrap?</h3> <nav class="navbar navbar-expand-lg navbar-dark bg-dark"> <a class="navbar-brand" href="#">Your Logo</a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="navbar-nav ml-auto"> <li class="nav-item active"> <a class="nav-link" href="#">Home</a> </li> <li class="nav-item"> <a class="nav-link" href="#">About Us</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Services</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Contact Us</a> </li> </ul> </div> </nav> </body> </html>
示例 2
在此示例中,我们将使用 Bootstrap 的内置类创建一个固定顶部导航栏。
文件名:index.html
<html lang="en"> <head> <title>How to display black navigation bar in Bootstrap?</title> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> </script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"> </script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"> </script> </head> <body> <h3>How to display black navigation bar in Bootstrap?</h3> <!-- Example 1: Bootstrap's built-in classes --> <nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top"> <a class="navbar-brand" href="#">Your Logo</a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="navbar-nav mr-auto"> <li class="nav-item active"> <a class="nav-link" href="#">Home</a> </li> <li class="nav-item"> <a class="nav-link" href="#">About Us</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Services</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Contact Us</a> </li> </ul> <form class="form-inline my-2 my-lg-0"> <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search"> <button class="btn btn-outline-light my-2 my-sm-0" type="submit">Search</button> </form> </div> </nav> </body> </html>
示例 3
在此示例中,我们将使用 Bootstrap 的 Sass 创建一个固定顶部导航栏。
文件名:index.html
<html lang="en"> <head> <title>How to display black navigation bar in Bootstrap?</title> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <h3>How to display black navigation bar in Bootstrap?</h3> <nav class="navbar navbar-expand-lg navbar-dark fixed-top" style="background-color: #000000;"> <a class="navbar-brand" href="#">Your Logo</a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="navbar-nav mr-auto"> <li class="nav-item active"> <a class="nav-link" href="#">Home</a> </li> <li class="nav-item"> <a class="nav-link" href="#">About Us</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Services</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Contact Us</a> </li> </ul> <form class="form-inline my-2 my-lg-0"> <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search"> <button class="btn btn-outline-light my-2 my-sm-0" type="submit">Search</button> </form> </div> </nav> </body> </html>
结论
在本文中,我们学习了如何使用 Bootstrap 类(如“navbar-dark”和“bg-dark”)在 Bootstrap 中显示黑色导航栏。在上面的示例中,我们创建了一个响应式导航栏,并使用上述类使其颜色变为黑色。
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