Bootstrap5中文教程
Bootstrap5中文教程
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Bootstrap5 小工具

2023-06-29 15:44 更新

Bootstrap 5 提供了很多有用的类来帮组我们快速实现效果，不需要重复写一些 CSS 代码。

背景颜色

设置不同元素的背景颜色时，需要通过 .text-* 类来设置匹配的文本颜色：


<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <div class="p-3 mb-2 bg-primary text-white">.bg-primary</div>
  <div class="p-3 mb-2 bg-secondary text-white">.bg-secondary</div>
  <div class="p-3 mb-2 bg-success text-white">.bg-success</div>
  <div class="p-3 mb-2 bg-danger text-white">.bg-danger</div>
  <div class="p-3 mb-2 bg-warning text-dark">.bg-warning</div>
  <div class="p-3 mb-2 bg-info text-dark">.bg-info</div>
  <div class="p-3 mb-2 bg-light text-dark">.bg-light</div>
  <div class="p-3 mb-2 bg-dark text-white">.bg-dark</div>
  <div class="p-3 mb-2 bg-body text-dark">.bg-body</div>
  <div class="p-3 mb-2 bg-white text-dark">.bg-white</div>
  <div class="p-3 mb-2 bg-transparent text-dark">.bg-transparent</div>
</div>

</body>
</html>

.bg-gradient 类可以设置背景颜色渐变的效果：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <div class="p-3 mb-2 bg-primary bg-gradient text-white">.bg-primary</div>
  <div class="p-3 mb-2 bg-secondary bg-gradient text-white">.bg-secondary</div>
  <div class="p-3 mb-2 bg-success bg-gradient text-white">.bg-success</div>
  <div class="p-3 mb-2 bg-danger bg-gradient text-white">.bg-danger</div>
  <div class="p-3 mb-2 bg-warning bg-gradient text-dark">.bg-warning</div>
  <div class="p-3 mb-2 bg-info bg-gradient text-dark">.bg-info</div>
  <div class="p-3 mb-2 bg-light bg-gradient text-dark">.bg-light</div>
  <div class="p-3 mb-2 bg-dark bg-gradient text-white">.bg-dark</div>
  <div class="p-3 mb-2 bg-body bg-gradient text-dark">.bg-body</div>
  <div class="p-3 mb-2 bg-white bg-gradient text-dark">.bg-white</div>
  <div class="p-3 mb-2 bg-transparent bg-gradient text-dark">.bg-transparent</div>
  </div>

</body>
</html>

边框

我们可以使用 border 相关类根据需要显示边框：


<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
  <style>
  span {
    display: inline-block;
    width: 75px;
    height: 75px;
    margin: 6px;
    background-color: #f9f9f9;
  }
  </style>
</head>
<body>

<div class="container mt-3">
	<span class="border"></span>
	<span class="border border-0"></span>
	<span class="border border-top-0"></span>
	<span class="border border-right-0"></span>
	<span class="border border-bottom-0"></span>
	<span class="border border-left-0"></span>
	<br>

	<span class="border-top"></span>
	<span class="border-end"></span>
	<span class="border-bottom"></span>
	<span class="border-start"></span>
</div>

</body>
</html>

.border-1 到 .border-5 类用于设置边框线条的宽度：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
  <style>
  span {
    display: inline-block;
    width: 75px;
    height: 75px;
    margin: 6px;
    background-color: #f9f9f9;
  }
  </style>
</head>
<body>

<div class="container mt-3">
	<span class="border border-1"></span>
	<span class="border border-2"></span>
	<span class="border border-3"></span>
	<span class="border border-4"></span>
	<span class="border border-5"></span>
</div>

</body>
</html>

以下设置了边框的不同颜色：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
  <style>
  span {
    display: inline-block;
    width: 75px;
    height: 75px;
    margin: 6px;
    background-color: #f9f9f9;
  }
  </style>
</head>
<body>

<div class="container mt-3">
	<span class="border border-primary"></span>
	<span class="border border-secondary"></span>
	<span class="border border-success"></span>
	<span class="border border-danger"></span>
	<span class="border border-warning"></span>
	<span class="border border-info"></span>
	<span class="border border-light"></span>
	<span class="border border-dark"></span>
	<span class="border border-white"></span>
</div>

</body>
</html>

rounded 相关类用于设置圆角：


<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
  <style>
  .bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
  }
  .rounded {
    border-radius: .25rem!important;
  }
  </style>
</head>
<body>

<div class="container mt-3">

	<svg class="bd-placeholder-img rounded" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-top" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example top rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example top rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-end" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example right rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example right rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-bottom" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example bottom rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example bottom rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-start" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example left rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example left rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-circle" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Completely round image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Completely round image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-pill" width="150" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Rounded pill image: 150x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Rounded pill image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">150x75</text></svg>

</div>


</body>
</html>

rounded-0 到 rounded-3 类用于设置圆角的大小：

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
  <style>
  .bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
  }
  </style>
</head>
<body>

<div class="container mt-3">
	
	<svg class="bd-placeholder-img rounded-0" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example non-rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example non-rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-1" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example small rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example small rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-2" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example default rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example default rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

	<svg class="bd-placeholder-img rounded-3" width="75" height="75" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Example large rounded image: 75x75" preserveAspectRatio="xMidYMid slice" focusable="false"><title>Example large rounded image</title><rect width="100%" height="100%" fill="#868e96"></rect><text x="50%" y="50%" fill="#dee2e6" dy=".3em">75x75</text></svg>

</div>


</body>
</html>

浮动与清除浮动

元素向右浮动使用 .float-end 类，向左浮动使用 .float-start 类， .clearfix 类用于清除浮动:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>
<div class="container mt-3">
  <h2>浮动</h2>
  <p>元素向右浮动使用 .float-end 类，向左浮动使用 .float-start 类， .clearfix 类用于清除浮动:</p> 
  <div class="clearfix">
    <span class="float-start">Float left</span>
    <span class="float-end">Float right</span>
  </div>
</div>

</body>
</html>

也可以根据屏幕尺寸来设置浮动效果(.float-*-left|right - * 表示 sm (>=576px), md (>=768px), lg (>=992px), xl (>=1200px) or xxl (>=1400px)):

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <h2>响应式浮动</h2>
  <p>可以根据屏幕尺寸来设置浮动效果(.float-*-left|right - * 表示 sm (&gt;=576px), md (&gt;=768px), lg (&gt;=992px), xl (&gt;=1200px) or xxl (&gt;=1400px)):</p>

  <p>重置浏览器查看效果</p> 
  <div class="clearfix">
    <div class="float-sm-end">小屏幕向右浮动</div><br>
    <div class="float-md-end">中等屏幕向右浮动</div><br>
    <div class="float-lg-end">大屏幕向右浮动</div><br>
    <div class="float-xl-end">超大屏幕向右浮动</div><br>
    <div class="float-xxl-end">特大屏幕向右浮动</div><br>
    <div class="float-none">没有浮动</div>
  </div>
</div>

</body>
</html>

居中对齐

使用 .mx-auto 类来设置元素居中对齐 (添加 margin-left 和 margin-right 为 auto):

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
  <div class="mx-auto bg-warning" style="width:150px">居中对齐</div>
</div>

</body>
</html>

宽度与高度

宽度使用 w-* (.w-25, .w-50, .w-75, .w-100, .mw-auto, .mw-100) 类来设置。

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
	<div class="w-25 bg-warning">宽度为 25%</div>
	<div class="w-50 bg-warning">宽度为 50%</div>
	<div class="w-75 bg-warning">宽度为 75%</div>
	<div class="w-100 bg-warning">宽度为 100%</div>
	<div class="w-auto bg-warning">自动设置宽度</div>
	<div class="mw-100 bg-warning">最大宽度为 100%</div>
</div>

</body>
</html>

高度使用 h-* (.h-25, .h-50, .h-75, .h-100, .mh-auto, .mh-100) 类来设置。

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/js/bootstrap.bundle.min.js" rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">
 
  <div style="height:200px;background-color:#ddd">
    <div class="h-25 d-inline-block p-2 bg-warning">高度为 25%</div>
    <div class="h-50 d-inline-block p-2 bg-warning">高度为 50%</div>
    <div class="h-75 d-inline-block p-2 bg-warning">高度为 75%</div>
    <div class="h-100 d-inline-block p-2 bg-warning">高度为 100%</div>
    <div class="h-auto d-inline-block p-2 bg-warning">自动设置高度</div>
    <div class="mh-100 d-inline-block p-2 bg-warning" style="height:500px">最大高度为 100%</div>
  </div>
</div>

</body>
</html>

间距

间距设置语法如下:

{property}{sides}-{size}  // 适用 xs(<=576px)
{property}{sides}-{breakpoint}-{size} // 适用 sm (>=576px), md (>=768px), lg (>=992px), xl (>=1200px) 或 xxl (>=1400px)
breakpoints 指的是屏幕宽度: xs (<=576px), sm (>=576px), md (>=768px), lg (>=992px), xl (>=1200px) 或 xxl (>=1400px)。

property 代表属性，包含：

  • m - 用来设置 margin
  • p - 用来设置 padding

sides 主要指方向：

  • t - 用来设置 margin-top 或 padding-top
  • b - 用来设置 margin-bottom 或 padding-bottom
  • s - 用来设置 margin-left 或 padding-left
  • e - 用来设置 margin-right 或 padding-right
  • x - 用来设置 *-left 和 *-right
  • y - 用来设置 *-top 和 *-bottom
  • blank - 用来设置元素在四个方向的 margin 或 padding

size 指的是边距的大小：

  • 0 - 设置 margin 或 padding 为 0
  • 1 - 设置 margin 或 padding 为 $spacer * .25
  • 2 - 设置 margin 或 padding 为 $spacer * .5
  • 3 - 设置 margin 或 padding 为 $spacer
  • 4 - 设置margin 或 padding 为 $spacer * 1.5
  • 5 - 设置 margin 或 padding 为 $spacer * 3
  • auto - 设置 margin 为 auto

看下部分边距的源码设置：

.mt-0 {
  margin-top: 0 !important;
}

.ml-1 {
  margin-left: ($spacer * .25) !important;
}

.px-2 {
  padding-left: ($spacer * .5) !important;
  padding-right: ($spacer * .5) !important;
}

.p-3 {
  padding: $spacer !important;
}
<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap5 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
  <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="container mt-3">

  <div class="mx-auto" style="width: 200px;">
    元素设置居中
  </div>


  <form>
    <div class="form-row">
      <div class="form-group">

      <label for="text" class="mt-2">设置 margin-top：</label>
      <input type="text" class="form-control" id="text" placeholder="email"> 

      <label for="color" class="mt-2">颜色：</label>
      <input type="color" id="color" class="form-control" style="width: 60px;padding: 4px;" autocomplete="off" value="#656565">
      </div>
    </div>
  </form>
</div>

</body>
</html>


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