Bootstrap4 实用工具

由 平台活动 创建, 最后一次修改 2018-06-02

在Bootstrap4中包含了很多实用的小工具,这些功能能够让你不用写 CSS 代码就能实现想要的效果,让开发更快捷和简单。

边框

使用 border 类可以添加或移除边框:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
 <style>
  .border {
    display: inline-block;
    width: 70px;
    height: 70px;
    margin: 6px;
  }
  </style>
</head>
<body>
<div class="container">
  <h2>边框</h2>
  <p>使用 border 类可以添加或移除边框:</p> 
  <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>
</div>
</body>
</html>

边框颜色

Bootstrap4 提供了一些类来设置边框颜色:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
  <style>
  .border {
    display: inline-block;
    width: 70px;
    height: 70px;
    margin: 6px;
  }
  </style>
</head>
<body>
<div class="container">
  <h2>边框颜色</h2>
  <p>Bootstrap4 提供了一些类来设置边框颜色:</p> 
  <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>

边框圆角设置

使用rounded 类可以添加圆角边框:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
  <style>
  span {
    display: inline-block;
    width: 70px;
    height: 70px;
    margin: 6px;
    background-color: #555;
  }
  </style>
</head>
<body>
<div class="container">
  <h2>边框圆角设置</h2>
  <p>使用rounded 类可以添加圆角边框:</p> 
  <span class="rounded"></span><!--全部圆角-->
  <span class="rounded-top"></span><!--上方圆角-->
  <span class="rounded-right"></span><!--右边圆角-->
  <span class="rounded-bottom"></span><!--下方圆角-->
  <span class="rounded-left"></span><!--左边圆角-->
  <span class="rounded-circle"></span><!--原型图片-->
  <span class="rounded-0"></span><!--没有圆角-->
</div>
</body>
</html>

浮动

.float-right 类用于设置元素右浮动, .float-left 设置元素左浮动, .clearfix 类用于清除浮动:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h2>浮动</h2>
  <p>.float-right 类用于设置元素右浮动, .float-left 设置元素左浮动, .clearfix 类用于清除浮动:</p> 
  <div class="clearfix">
    <span class="float-left">左浮动</span>
    <span class="float-right">右浮动</span>
  </div>
</div>
</body>
</html>

响应式浮动

我们看可以设置浮动 (.float-*-left|right - * 为 sm, md, lg 或 xl)的方向依赖于屏幕的大小:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h2>响应式浮动</h2>
  <p>重置浏览器大小查看效果。</p>
  <p>我们看可以设置浮动 (.float-*-left|right - * 为 sm, md, lg 或 xl)的方向依赖于屏幕的大小:</p> 
  <div class="float-sm-right">在大于小屏幕尺寸上右浮动</div><br>
  <div class="float-md-right">在大于中等屏幕尺寸上右浮动</div><br>
  <div class="float-lg-right">在大于大屏幕尺寸上右浮动</div><br>
  <div class="float-xl-right">在大于超大屏幕尺寸上右浮动</div><br>
  <div class="float-none">没有浮动</div>
</div>
</body>
</html>

居中对齐

使用 .mx-auto 类来设置居中对齐:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h1>水平居中</h1>
  <p>使用 .mx-auto 类来设置居中对齐::</p>
  <div class="mx-auto bg-warning" style="width:150px">居中</div>
</div>
</body>
</html>

宽度

元素上使用 w-* 类 (.w-25, .w-50, .w-75, .w-100, .mw-100) 来设置宽度:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h1>宽度设置小工具</h1>
  <p>元素上使用 w-* 类 (.w-25, .w-50, .w-75, .w-100, .mw-100) 来设置宽度:</p>
  <div class="w-25 bg-warning">宽度 25%</div>
  <div class="w-50 bg-warning">宽度 50%</div>
  <div class="w-75 bg-warning">宽度 75%</div>
  <div class="w-100 bg-warning">宽度 100%</div>
  <div class="mw-100 bg-warning">最大宽度 100%</div>
</div>
</body>
</html>

高度

元素上使用 h-* 类 (.h-25, .h-50, .h-75, .h-100, .mh-100) 来设置高度:

实例:

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap4 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
  <h1>高度小工具</h1>
  <p>元素上使用 h-* 类 (.h-25, .h-50, .h-75, .h-100, .mh-100) 来设置高度:</p>
  <div style="height:200px;background-color:#ddd">
    <div class="h-25 d-inline-block p-2 bg-warning">高度 25%</div>
    <div class="h-50 d-inline-block p-2 bg-warning">高度 50%</div>
    <div class="h-75 d-inline-block p-2 bg-warning">高度 75%</div>
    <div class="h-100 d-inline-block p-2 bg-warning">高度 100%</div>
    <div class="mh-100 d-inline-block p-2 bg-warning" style="height:500px">最大高度 100%</div>
  </div>
</div>
</body>
</html>


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