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边框

使用边框工具快速设置元素的边框和边框半径的样式。非常适合图片、按钮或任何其他元素。

目录

边框

¥Border

使用边框实用程序添加或删除元素的边框。从所有边框中选择或一次选择一个。

¥Use border utilities to add or remove an element’s borders. Choose from all borders or one at a time.

添加剂

¥Additive

为自定义元素添加边框：

¥Add borders to custom elements:

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

减法

¥Subtractive

或者删除边框：

¥Or remove borders:

html 
<span class="border border-0"></span>
<span class="border border-top-0"></span>
<span class="border border-end-0"></span>
<span class="border border-bottom-0"></span>
<span class="border border-start-0"></span>

颜色

¥Color

像 .border-* 这样的边框实用程序（由我们最初的 $theme-colors Sass 映射表生成）目前还不支持颜色模式，但是任何 .border-*-subtle 实用程序都可以支持。这个问题将在 v6 中得到解决。

¥Border utilities like .border-* that generated from our original $theme-colors Sass map don’t yet respond to color modes, however, any .border-*-subtle utility will. This will be resolved in v6.

使用基于我们的主题颜色构建的工具更改边框颜色。

¥Change the border color using utilities built on our theme colors.

html 
<span class="border border-primary"></span>
<span class="border border-primary-subtle"></span>
<span class="border border-secondary"></span>
<span class="border border-secondary-subtle"></span>
<span class="border border-success"></span>
<span class="border border-success-subtle"></span>
<span class="border border-danger"></span>
<span class="border border-danger-subtle"></span>
<span class="border border-warning"></span>
<span class="border border-warning-subtle"></span>
<span class="border border-info"></span>
<span class="border border-info-subtle"></span>
<span class="border border-light"></span>
<span class="border border-light-subtle"></span>
<span class="border border-dark"></span>
<span class="border border-dark-subtle"></span>
<span class="border border-black"></span>
<span class="border border-white"></span>

或者修改某个组件默认的 border-color：

¥Or modify the default border-color of a component:

Dangerous heading
Changing border color and width
html 
<div class="mb-4">
  <label for="exampleFormControlInput1" class="form-label">Email address</label>
  <input type="email" class="form-control border-success" id="exampleFormControlInput1" placeholder="name@example.com">
</div>

<div class="h4 pb-2 mb-4 text-danger border-bottom border-danger">
  Dangerous heading
</div>

<div class="p-3 bg-info bg-opacity-10 border border-info border-start-0 rounded-end">
  Changing border color and width
</div>

不透明度

¥Opacity

Added in v5.2.0

Bootstrap border-{color} 工具是使用 CSS 变量通过 Sass 生成的。这允许实时颜色变化而无需编译和动态 Alpha 透明度变化。

¥Bootstrap border-{color} utilities are generated with Sass using CSS variables. This allows for real-time color changes without compilation and dynamic alpha transparency changes.

怎么运行的

¥How it works

考虑我们默认的 .border-success 工具。

¥Consider our default .border-success utility.

.border-success {
  --bs-border-opacity: 1;
  border-color: rgba(var(--bs-success-rgb), var(--bs-border-opacity)) !important;
}

我们使用 --bs-success 的 RGB 版本（值为 25, 135, 84）CSS 变量，并附加第二个 CSS 变量 --bs-border-opacity，用于 alpha 透明度（由于本地 CSS 变量，默认值为 1）。这意味着你现在使用 .border-success 时，计算出的 color 值为 rgba(25, 135, 84, 1)。每个 .border-* 类内的本地 CSS 变量避免了继承问题，因此实用程序的嵌套实例不会自动具有修改后的 Alpha 透明度。

¥We use an RGB version of our --bs-success (with the value of 25, 135, 84) CSS variable and attached a second CSS variable, --bs-border-opacity, for the alpha transparency (with a default value 1 thanks to a local CSS variable). That means anytime you use .border-success now, your computed color value is rgba(25, 135, 84, 1). The local CSS variable inside each .border-* class avoids inheritance issues so nested instances of the utilities don’t automatically have a modified alpha transparency.

示例

¥Example

要更改该不透明度，请通过自定义样式或内联样式覆盖 --bs-border-opacity。

¥To change that opacity, override --bs-border-opacity via custom styles or inline styles.

This is default success border
This is 50% opacity success border
html 
<div class="border border-success p-2 mb-2">This is default success border</div>
<div class="border border-success p-2" style="--bs-border-opacity: .5;">This is 50% opacity success border</div>

或者，从任何 .border-opacity 工具中进行选择：

¥Or, choose from any of the .border-opacity utilities:

This is default success border
This is 75% opacity success border
This is 50% opacity success border
This is 25% opacity success border
This is 10% opacity success border
html 
<div class="border border-success p-2 mb-2">This is default success border</div>
<div class="border border-success p-2 mb-2 border-opacity-75">This is 75% opacity success border</div>
<div class="border border-success p-2 mb-2 border-opacity-50">This is 50% opacity success border</div>
<div class="border border-success p-2 mb-2 border-opacity-25">This is 25% opacity success border</div>
<div class="border border-success p-2 border-opacity-10">This is 10% opacity success border</div>

宽度

¥Width

html 
<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>

半径

¥Radius

向元素添加类以轻松圆角。

¥Add classes to an element to easily round its corners.

Example rounded image75x75 Example top rounded image75x75 Example right rounded image75x75 Example bottom rounded image75x75 Example left rounded image75x75
html 
<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="...">

尺寸

¥Sizes

对较大或较小的圆角使用缩放类别。尺寸范围从 0 到 5，包括 circle 和 pill，可以通过修改实用程序 API 进行配置。

¥Use the scaling classes for larger or smaller rounded corners. Sizes range from 0 to 5 including circle and pill, and can be configured by modifying the utilities API.

Example non-rounded image75x75 Example small rounded image75x75 Example default rounded image75x75 Example large rounded image75x75 Example larger rounded image75x75 Example extra large rounded image75x75 Completely round image75x75 Rounded pill image150x75
html 
<img src="..." class="rounded-0" alt="...">
<img src="..." class="rounded-1" alt="...">
<img src="..." class="rounded-2" alt="...">
<img src="..." class="rounded-3" alt="...">
<img src="..." class="rounded-4" alt="...">
<img src="..." class="rounded-5" alt="...">
<img src="..." class="rounded-circle" alt="...">
<img src="..." class="rounded-pill" alt="...">
Example small rounded image75x75 Example default left rounded image75x75 Example right completely round image75x75 Example left rounded pill image75x75 Example extra large bottom rounded image75x75
html 
<img src="..." class="rounded-bottom-1" alt="...">
<img src="..." class="rounded-start-2" alt="...">
<img src="..." class="rounded-end-circle" alt="...">
<img src="..." class="rounded-start-pill" alt="...">
<img src="..." class="rounded-5 rounded-top-0" alt="...">

CSS

变量

¥Variables

Added in v5.2.0
scss/_root.scss 
--#{$prefix}border-width: #{$border-width};
--#{$prefix}border-style: #{$border-style};
--#{$prefix}border-color: #{$border-color};
--#{$prefix}border-color-translucent: #{$border-color-translucent};

--#{$prefix}border-radius: #{$border-radius};
--#{$prefix}border-radius-sm: #{$border-radius-sm};
--#{$prefix}border-radius-lg: #{$border-radius-lg};
--#{$prefix}border-radius-xl: #{$border-radius-xl};
--#{$prefix}border-radius-xxl: #{$border-radius-xxl};
--#{$prefix}border-radius-2xl: var(--#{$prefix}border-radius-xxl); // Deprecated in v5.3.0 for consistency
--#{$prefix}border-radius-pill: #{$border-radius-pill};

Sass 变量

¥Sass variables

scss/_variables.scss 
$border-width:                1px;
$border-widths: (
  1: 1px,
  2: 2px,
  3: 3px,
  4: 4px,
  5: 5px
);
$border-style:                solid;
$border-color:                $gray-300;
$border-color-translucent:    rgba($black, .175);
scss/_variables.scss 
$border-radius:               .375rem;
$border-radius-sm:            .25rem;
$border-radius-lg:            .5rem;
$border-radius-xl:            1rem;
$border-radius-xxl:           2rem;
$border-radius-pill:          50rem;

用于在浅色和夜间模式下在 .border-*-subtle 工具中设置 border-color 的变量：

¥Variables for setting border-color in .border-*-subtle utilities in light and dark mode:

scss/_variables.scss 
$primary-border-subtle:   tint-color($primary, 60%);
$secondary-border-subtle: tint-color($secondary, 60%);
$success-border-subtle:   tint-color($success, 60%);
$info-border-subtle:      tint-color($info, 60%);
$warning-border-subtle:   tint-color($warning, 60%);
$danger-border-subtle:    tint-color($danger, 60%);
$light-border-subtle:     $gray-200;
$dark-border-subtle:      $gray-500;
scss/_variables-dark.scss 
$primary-border-subtle-dark:        shade-color($primary, 40%);
$secondary-border-subtle-dark:      shade-color($secondary, 40%);
$success-border-subtle-dark:        shade-color($success, 40%);
$info-border-subtle-dark:           shade-color($info, 40%);
$warning-border-subtle-dark:        shade-color($warning, 40%);
$danger-border-subtle-dark:         shade-color($danger, 40%);
$light-border-subtle-dark:          $gray-700;
$dark-border-subtle-dark:           $gray-800;

Sass 映射

¥Sass maps

颜色模式自适应边框颜色也可用作 Sass 映射：

¥Color mode adaptive border colors are also available as a Sass map:

scss/_maps.scss 
$theme-colors-border-subtle: (
  "primary": $primary-border-subtle,
  "secondary": $secondary-border-subtle,
  "success": $success-border-subtle,
  "info": $info-border-subtle,
  "warning": $warning-border-subtle,
  "danger": $danger-border-subtle,
  "light": $light-border-subtle,
  "dark": $dark-border-subtle,
);
scss/_maps.scss 
$theme-colors-border-subtle-dark: (
  "primary": $primary-border-subtle-dark,
  "secondary": $secondary-border-subtle-dark,
  "success": $success-border-subtle-dark,
  "info": $info-border-subtle-dark,
  "warning": $warning-border-subtle-dark,
  "danger": $danger-border-subtle-dark,
  "light": $light-border-subtle-dark,
  "dark": $dark-border-subtle-dark,
);

Sass 混入

¥Sass mixins

scss/mixins/_border-radius.scss 
@mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
  @if $enable-rounded {
    border-radius: valid-radius($radius);
  }
  @else if $fallback-border-radius != false {
    border-radius: $fallback-border-radius;
  }
}

@mixin border-top-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-left-radius: valid-radius($radius);
    border-top-right-radius: valid-radius($radius);
  }
}

@mixin border-end-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-right-radius: valid-radius($radius);
    border-bottom-right-radius: valid-radius($radius);
  }
}

@mixin border-bottom-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-bottom-right-radius: valid-radius($radius);
    border-bottom-left-radius: valid-radius($radius);
  }
}

@mixin border-start-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-left-radius: valid-radius($radius);
    border-bottom-left-radius: valid-radius($radius);
  }
}

@mixin border-top-start-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-left-radius: valid-radius($radius);
  }
}

@mixin border-top-end-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-top-right-radius: valid-radius($radius);
  }
}

@mixin border-bottom-end-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-bottom-right-radius: valid-radius($radius);
  }
}

@mixin border-bottom-start-radius($radius: $border-radius) {
  @if $enable-rounded {
    border-bottom-left-radius: valid-radius($radius);
  }
}

Sass 工具 API

¥Sass utilities API

边界实用工具在 scss/_utilities.scss 的实用工具 API 中声明。了解如何使用实用程序 API。

¥Border utilities are declared in our utilities API in scss/_utilities.scss. Learn how to use the utilities API.

scss/_utilities.scss 
"border": (
  property: border,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-top": (
  property: border-top,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-end": (
  property: border-right,
  class: border-end,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-bottom": (
  property: border-bottom,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-start": (
  property: border-left,
  class: border-start,
  values: (
    null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
    0: 0,
  )
),
"border-color": (
  property: border-color,
  class: border,
  local-vars: (
    "border-opacity": 1
  ),
  values: $utilities-border-colors
),
"subtle-border-color": (
  property: border-color,
  class: border,
  values: $utilities-border-subtle
),
"border-width": (
  property: border-width,
  class: border,
  values: $border-widths
),
"border-opacity": (
  css-var: true,
  class: border-opacity,
  values: (
    10: .1,
    25: .25,
    50: .5,
    75: .75,
    100: 1
  )
),
scss/_utilities.scss 
"rounded": (
  property: border-radius,
  class: rounded,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-top": (
  property: border-top-left-radius border-top-right-radius,
  class: rounded-top,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-end": (
  property: border-top-right-radius border-bottom-right-radius,
  class: rounded-end,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-bottom": (
  property: border-bottom-right-radius border-bottom-left-radius,
  class: rounded-bottom,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),
"rounded-start": (
  property: border-bottom-left-radius border-top-left-radius,
  class: rounded-start,
  values: (
    null: var(--#{$prefix}border-radius),
    0: 0,
    1: var(--#{$prefix}border-radius-sm),
    2: var(--#{$prefix}border-radius),
    3: var(--#{$prefix}border-radius-lg),
    4: var(--#{$prefix}border-radius-xl),
    5: var(--#{$prefix}border-radius-xxl),
    circle: 50%,
    pill: var(--#{$prefix}border-radius-pill)
  )
),