Bootstrap5 小工具

Bootstrap5 小工具

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：

实例

<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>

.bg-gradient 类可以设置背景颜色渐变的效果：

实例

<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>

边框

我们可以使用 border 相关类根据需要显示边框：

实例

<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>

.border-1 到 .border-5 类用于设置边框线条的宽度：

实例

<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>

以下设置了边框的不同颜色：

实例

<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>

rounded 相关类用于设置圆角：

实例

<img src="..." class="rounded" alt="...">
<img src="..." class="rounded-top" alt="...">
<img src="..." class="rounded-end" alt="...">
<img src="..." class="rounded-bottom" alt="...">
<img src="..." class="rounded-start" alt="...">
<img src="..." class="rounded-circle" alt="...">
<img src="..." class="rounded-pill" alt="...">

rounded-0 到 rounded-3 类用于设置圆角的大小：

实例

<img src="..." class="rounded-0" alt="...">
<img src="..." class="rounded-1" alt="...">
<img src="..." class="rounded-2" alt="...">
<img src="..." class="rounded-3" alt="...">

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:

实例

<div class="clearfix">
  <span class="float-start">Float left</span>
  <span class="float-end">Float right</span>
</div>

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)):

实例

<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>

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):

实例

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

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。

实例

<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>

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

实例

<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>