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颜色

通过 color 使用一些颜色工具类传达含义。还包括对具有悬停状态的样式链接的支持。

目录
Accessibility tip: Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies like screen readers. Please ensure the meaning is obvious from the content itself (e.g., the visible text with a sufficient color contrast) or is included through alternative means, such as additional text hidden with the .visually-hidden class.

颜色

¥Colors

使用颜色工具为文本着色。如果你想给链接着色，你可以使用具有 :hover 和 :focus 状态的 .link-* 辅助类。

¥Colorize text with color utilities. If you want to colorize links, you can use the .link-* helper classes which have :hover and :focus states.

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

.text-primary

.text-primary-emphasis

.text-secondary

.text-secondary-emphasis

.text-success

.text-success-emphasis

.text-danger

.text-danger-emphasis

.text-warning

.text-warning-emphasis

.text-info

.text-info-emphasis

.text-light

.text-light-emphasis

.text-dark

.text-dark-emphasis

.text-body

.text-body-emphasis

.text-body-secondary

.text-body-tertiary

.text-black

.text-white

.text-black-50

.text-white-50

html 
<p class="text-primary">.text-primary</p>
<p class="text-primary-emphasis">.text-primary-emphasis</p>
<p class="text-secondary">.text-secondary</p>
<p class="text-secondary-emphasis">.text-secondary-emphasis</p>
<p class="text-success">.text-success</p>
<p class="text-success-emphasis">.text-success-emphasis</p>
<p class="text-danger">.text-danger</p>
<p class="text-danger-emphasis">.text-danger-emphasis</p>
<p class="text-warning bg-dark">.text-warning</p>
<p class="text-warning-emphasis">.text-warning-emphasis</p>
<p class="text-info bg-dark">.text-info</p>
<p class="text-info-emphasis">.text-info-emphasis</p>
<p class="text-light bg-dark">.text-light</p>
<p class="text-light-emphasis">.text-light-emphasis</p>
<p class="text-dark bg-white">.text-dark</p>
<p class="text-dark-emphasis">.text-dark-emphasis</p>

<p class="text-body">.text-body</p>
<p class="text-body-emphasis">.text-body-emphasis</p>
<p class="text-body-secondary">.text-body-secondary</p>
<p class="text-body-tertiary">.text-body-tertiary</p>

<p class="text-black bg-white">.text-black</p>
<p class="text-white bg-dark">.text-white</p>
<p class="text-black-50 bg-white">.text-black-50</p>
<p class="text-white-50 bg-dark">.text-white-50</p>
Deprecation: With the addition of .text-opacity-* utilities and CSS variables for text utilities, .text-black-50 and .text-white-50 are deprecated as of v5.1.0. They’ll be removed in v6.0.0.
Deprecation: With the addition of the expanded theme colors and variables, the .text-muted utility has been deprecated as of v5.3.0. Its default value has also been reassigned to the new --bs-secondary-color CSS variable to better support color modes. It will be removed in v6.0.0.

不透明度

¥Opacity

Added in v5.1.0

从 v5.1.0 开始，文本颜色工具是使用 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。

¥As of v5.1.0, text 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 .text-primary 工具。

¥Consider our default .text-primary utility.

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

我们使用 --bs-primary 的 RGB 版本（值为 13, 110, 253）CSS 变量，并附加第二个 CSS 变量 --bs-text-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 .text-primary 时，计算出的 color 值为 rgba(13, 110, 253, 1)。每个 .text-* 类中的本地 CSS 变量避免了继承问题，因此工具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-primary (with the value of 13, 110, 253) CSS variable and attached a second CSS variable, --bs-text-opacity, for the alpha transparency (with a default value 1 thanks to a local CSS variable). That means anytime you use .text-primary now, your computed color value is rgba(13, 110, 253, 1). The local CSS variable inside each .text-* 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-text-opacity。

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

This is default primary text
This is 50% opacity primary text
html 
<div class="text-primary">This is default primary text</div>
<div class="text-primary" style="--bs-text-opacity: .5;">This is 50% opacity primary text</div>

或者，从任何 .text-opacity 工具中进行选择：

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

This is default primary text
This is 75% opacity primary text
This is 50% opacity primary text
This is 25% opacity primary text
html 
<div class="text-primary">This is default primary text</div>
<div class="text-primary text-opacity-75">This is 75% opacity primary text</div>
<div class="text-primary text-opacity-50">This is 50% opacity primary text</div>
<div class="text-primary text-opacity-25">This is 25% opacity primary text</div>

特异性

¥Specificity

有时，由于另一个选择器的特殊性，上下文类无法应用。在某些情况下，足够的解决方法是将元素的内容封装在具有所需类的 <div> 或更多语义元素中。

¥Sometimes contextual classes cannot be applied due to the specificity of another selector. In some cases, a sufficient workaround is to wrap your element’s content in a <div> or more semantic element with the desired class.

CSS

除了以下 Sass 功能之外，请考虑阅读我们包含的颜色等的 CSS 自定义属性（又名 CSS 变量）。

¥In addition to the following Sass functionality, consider reading about our included CSS custom properties (aka CSS variables) for colors and more.

Sass 变量

¥Sass variables

大多数 color 工具都是由我们的主题颜色生成的，并从我们的通用调色板变量中重新分配。

¥Most color utilities are generated by our theme colors, reassigned from our generic color palette variables.

scss/_variables.scss 
$blue:    #0d6efd;
$indigo:  #6610f2;
$purple:  #6f42c1;
$pink:    #d63384;
$red:     #dc3545;
$orange:  #fd7e14;
$yellow:  #ffc107;
$green:   #198754;
$teal:    #20c997;
$cyan:    #0dcaf0;
scss/_variables.scss 
$primary:       $blue;
$secondary:     $gray-600;
$success:       $green;
$info:          $cyan;
$warning:       $yellow;
$danger:        $red;
$light:         $gray-100;
$dark:          $gray-900;

灰度颜色也可用，但只有一个子集用于生成任何工具。

¥Grayscale colors are also available, but only a subset are used to generate any utilities.

scss/_variables.scss 
$white:    #fff;
$gray-100: #f8f9fa;
$gray-200: #e9ecef;
$gray-300: #dee2e6;
$gray-400: #ced4da;
$gray-500: #adb5bd;
$gray-600: #6c757d;
$gray-700: #495057;
$gray-800: #343a40;
$gray-900: #212529;
$black:    #000;
scss/_maps.scss 
$theme-colors-text: (
  "primary": $primary-text-emphasis,
  "secondary": $secondary-text-emphasis,
  "success": $success-text-emphasis,
  "info": $info-text-emphasis,
  "warning": $warning-text-emphasis,
  "danger": $danger-text-emphasis,
  "light": $light-text-emphasis,
  "dark": $dark-text-emphasis,
);

用于在浅色和夜间模式下在 .text-*-emphasis 工具中设置颜色的变量：

¥Variables for setting colors in .text-*-emphasis utilities in light and dark mode:

scss/_variables.scss 
$primary-text-emphasis:   shade-color($primary, 60%);
$secondary-text-emphasis: shade-color($secondary, 60%);
$success-text-emphasis:   shade-color($success, 60%);
$info-text-emphasis:      shade-color($info, 60%);
$warning-text-emphasis:   shade-color($warning, 60%);
$danger-text-emphasis:    shade-color($danger, 60%);
$light-text-emphasis:     $gray-700;
$dark-text-emphasis:      $gray-700;
scss/_variables-dark.scss 
$primary-text-emphasis-dark:        tint-color($primary, 40%);
$secondary-text-emphasis-dark:      tint-color($secondary, 40%);
$success-text-emphasis-dark:        tint-color($success, 40%);
$info-text-emphasis-dark:           tint-color($info, 40%);
$warning-text-emphasis-dark:        tint-color($warning, 40%);
$danger-text-emphasis-dark:         tint-color($danger, 40%);
$light-text-emphasis-dark:          $gray-100;
$dark-text-emphasis-dark:           $gray-300;

Sass 映射

¥Sass maps

然后主题颜色被放入 Sass 映射中，以便我们可以循环它们以生成我们的工具、组件修饰符等。

¥Theme colors are then put into a Sass map so we can loop over them to generate our utilities, component modifiers, and more.

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

灰度颜色也可用作 Sass 贴图。该映射不用于生成任何工具。

¥Grayscale colors are also available as a Sass map. This map is not used to generate any utilities.

scss/_variables.scss 
$grays: (
  "100": $gray-100,
  "200": $gray-200,
  "300": $gray-300,
  "400": $gray-400,
  "500": $gray-500,
  "600": $gray-600,
  "700": $gray-700,
  "800": $gray-800,
  "900": $gray-900
);

RGB 颜色是从单独的 Sass 映射生成的：

¥RGB colors are generated from a separate Sass map:

scss/_maps.scss 
$theme-colors-rgb: map-loop($theme-colors, to-rgb, "$value");

颜色不透明度建立在其自己的映射上，由工具 API 使用：

¥Color opacities build on that with their own map that’s consumed by the utilities API:

scss/_maps.scss 
$utilities-text: map-merge(
  $utilities-colors,
  (
    "black": to-rgb($black),
    "white": to-rgb($white),
    "body": to-rgb($body-color)
  )
);
$utilities-text-colors: map-loop($utilities-text, rgba-css-var, "$key", "text");

$utilities-text-emphasis-colors: (
  "primary-emphasis": var(--#{$prefix}primary-text-emphasis),
  "secondary-emphasis": var(--#{$prefix}secondary-text-emphasis),
  "success-emphasis": var(--#{$prefix}success-text-emphasis),
  "info-emphasis": var(--#{$prefix}info-text-emphasis),
  "warning-emphasis": var(--#{$prefix}warning-text-emphasis),
  "danger-emphasis": var(--#{$prefix}danger-text-emphasis),
  "light-emphasis": var(--#{$prefix}light-text-emphasis),
  "dark-emphasis": var(--#{$prefix}dark-text-emphasis)
);

颜色模式自适应文本颜色也可用作 Sass 映射：

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

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

Sass 工具 API

¥Sass utilities API

颜色工具在 scss/_utilities.scss 中的工具 API 中声明。Learn how to use the utilities API.

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

scss/_utilities.scss 
"color": (
  property: color,
  class: text,
  local-vars: (
    "text-opacity": 1
  ),
  values: map-merge(
    $utilities-text-colors,
    (
      "muted": var(--#{$prefix}secondary-color), // deprecated
      "black-50": rgba($black, .5), // deprecated
      "white-50": rgba($white, .5), // deprecated
      "body-secondary": var(--#{$prefix}secondary-color),
      "body-tertiary": var(--#{$prefix}tertiary-color),
      "body-emphasis": var(--#{$prefix}emphasis-color),
      "reset": inherit,
    )
  )
),
"text-opacity": (
  css-var: true,
  class: text-opacity,
  values: (
    25: .25,
    50: .5,
    75: .75,
    100: 1
  )
),
"text-color": (
  property: color,
  class: text,
  values: $utilities-text-emphasis-colors
),