引导 4 |导航栏
原文:https://www.geeksforgeeks.org/bootstrap-4-navigation-bar/
每个网站都使用导航栏，以使其更加用户友好，从而使网站导航变得容易，用户可以直接搜索他们感兴趣的主题。导航栏位于页面的顶部。 基本导航栏:。navbar 类用于创建导航栏。通过使用响应创建 navbar。navbar-expand-xl|lg|md|sm 类。响应式 navbar 垂直堆叠在小屏幕中。< class="nav-item" >元素后跟< a class="nav-link" >用于创建 nav link。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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 style="text-align:center;">
<div class="container">
<h1 style="color:green;">
GeeksforGeeks
</h1>
<h2>Navigation Bar</h2>
<nav class="navbar navbar-expand-sm bg-light">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
</div>
</body>
</html>
输出:
垂直导航条:。navbar-expand-xl|lg|md|sm 类用于创建垂直导航栏。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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 style="text-align:center;">
<div class="container">
<h1 style="color:green;">
GeeksforGeeks
</h1>
<h2>Vertical Navbar</h2>
<nav class="navbar navbar-expand-xl|lg|md|sm">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
</div>
</body>
</html>
输出:
中央导航条:。对齐-内容中心类用于将导航栏的对齐方式设置为居中。导航栏在中、大、超大屏幕上居中显示。在小屏幕的情况下，导航栏垂直显示并左对齐。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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 style="text-align:center;">
<div class="container">
<h1 style="color:green;">
GeeksforGeeks
</h1>
<h2>Centered Navbar</h2>
<nav class="navbar navbar-expand-sm bg-light justify-content-center">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
</div>
</body>
</html>
输出:
彩色导航条:。bg-color 类用于更改导航栏的背景颜色。bg-color 类是:。bg-primary，。BG-成功，。BG-信息，。BG-警告。BG-危险。BG-二级。BG-深色和。bg 灯。。navbar-dark 类用于将链接文本颜色设置为白色和。navbar-light 类用于将链接文本颜色设置为黑色。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Colored Navbar</h2>
<nav class="navbar navbar-expand-sm bg-primary navbar-dark">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
<br><br>
<nav class="navbar navbar-expand-sm bg-success navbar-light">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
</div>
</body>
</html>
输出:
品牌/标志导航条:。navbar-brand 类用于突出品牌/logo 名称。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Brand/Logo navbar</h2>
<nav class="navbar navbar-expand-sm bg-primary navbar-dark">
<a class="navbar-brand" href="#">GFG</a>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
<br><br>
<nav class="navbar navbar-expand-sm bg-success navbar-light">
<a class="navbar-brand" href="#">
<img src=
"https://www.geeksforgeeks.org/wp-content/uploads/gfg_transparent_white_small.png"
alt="logo" style="width:40px;">
</a>
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
</div>
</body>
</html>
输出:
折叠导航条:折叠导航条用于小屏幕。它隐藏了导航链接，并替换为一个按钮。class="navbar-toggler "、data-toggle="collapse "和 data-target="#thetarget "用于创建折叠导航栏。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Collapsing Navbar</h2>
<nav class="navbar navbar-expand-sm bg-success navbar-light">
<!-- Brand/logo -->
<a class="navbar-brand" href="#">
<img src=
"https://www.geeksforgeeks.org/wp-content/uploads/gfg_transparent_white_small.png"
alt="logo" style="width:40px;">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#collapse_Navbar">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapse_Navbar">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</div>
</nav>
</div>
</body>
</html>
输出: 大屏幕上:
小屏幕上:
下拉导航栏:可以使用下拉菜单创建导航栏。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Dropdown Navbar</h2>
<nav class="navbar navbar-expand-sm bg-success navbar-dark">
<!-- Brand/logo -->
<a class="navbar-brand" href="#">
<img src=
"https://www.geeksforgeeks.org/wp-content/uploads/gfg_transparent_white_small.png"
alt="logo" style="width:40px;">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#collapse_Navbar">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapse_Navbar">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#"
id="navbardrop" data-toggle="dropdown">
Languages
</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>
</div>
</nav>
</div>
</body>
</html>
输出:
表单和按钮导航栏:<表单类=“表单-内联”>元素用于并排分组输入和按钮。。输入-组-前置或。输入-分组-追加类用于附加输入文本字段的图标。 例 1:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Forms and Buttons Navbar</h2>
<nav class="navbar navbar-expand-sm bg-success navbar-dark">
<!-- Brand/logo -->
<a class="navbar-brand" href="#">
<img src=
"https://www.geeksforgeeks.org/wp-content/uploads/gfg_transparent_white_small.png"
alt="logo" style="width:40px;">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#collapse_Navbar">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapse_Navbar">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
</ul>
</div>
<form class="form-inline" action="#">
<input class="form-control mr-sm-2" type="text"
placeholder="Search">
<button class="btn btn-primary" type="submit">Search</button>
</form>
</nav>
</div>
</body>
</html>
输出:
例 2:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Forms and Buttons Navbar</h2>
<nav class="navbar navbar-expand-sm bg-success navbar-dark">
<!-- Brand/logo -->
<a class="navbar-brand" href="#">
<img src=
"https://www.geeksforgeeks.org/wp-content/uploads/gfg_transparent_white_small.png"
alt="logo" style="width:40px;">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#collapse_Navbar">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapse_Navbar">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
</ul>
</div>
<form class="form-inline" action="#">
<div class="input-group">
<div class="input-group-prepend">
<span class="input-group-text">@</span>
</div>
<input type="text" class="form-control"
placeholder="Username">
</form>
</nav>
</div>
</body>
</html>
输出:
文字导航条:。navbar-text 类用于向导航栏添加文本元素。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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>
<div class="container">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Text Navbar</h2>
<nav class="navbar navbar-expand-sm bg-success navbar-dark">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<span class="navbar-text">
DS
</span>
</ul>
</nav>
</div>
</body>
</html>
输出:
固定导航条:。固定顶类用于将导航栏固定在顶部位置和。固定底部类用于将导航栏固定在底部位置。 例 1:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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 style="height:1000px">
<nav class="navbar navbar-expand-sm bg-success navbar-dark fixed-top">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
<div class="container-fluid" style="margin-top:80px">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Fixed Top Navbar</h2>
</div>
</body>
</html>
输出:
例 2:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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 style="height:1000px">
<nav class="navbar navbar-expand-sm bg-success navbar-dark fixed-bottom">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
<div class="container-fluid" style="margin-top:80px">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Fixed Bottom Navbar</h2>
</div>
</body>
</html>
输出:
粘性导航条:。粘性顶端类用于创建粘性导航栏。滚动页面时，粘性导航栏固定在页面顶部。 例:
超文本标记语言
<!DOCTYPE html>
<html lang="en">
<head>
<title>Navigation Bar</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<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 style="height:1000px">
<div class="container-fluid">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<h2 style="text-align:center;">Sticky Navbar</h2>
</div>
<nav class="navbar navbar-expand-sm bg-success navbar-dark sticky-top">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Algo</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">DS</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Languages</a>
</li>
</ul>
</nav>
<div class="container-fluid" style="margin-top:80px">
<h1 style="color:green;text-align:center;">
GeeksforGeeks
</h1>
<div style="text-align:center;">
A computer science portal for geeks
</div>
</div>
</body>
</html>
输出:
支持的浏览器:
- 谷歌 Chrome
- 微软公司出品的 web 浏览器
- 火狐浏览器
- 歌剧
- 旅行队
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