颜色（Colors）

借助一些颜色通用类别让颜色的表达具有意义。这也包括支持有hover状态的样式连接。

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颜色

使用color通用类别为文字上色。如果要为链接上色，你可以使用助手中的彩色链接。它们具有：hover and：focus的状态。

.text-primary

.text-secondary

.text-success

.text-danger

.text-warning

.text-info

.text-light

.text-dark

.text-body

.text-muted

.text-white

.text-black-50

.text-white-50

<p class="text-primary">.text-primary</p>
        <p class="text-secondary">.text-secondary</p>
        <p class="text-success">.text-success</p>
        <p class="text-danger">.text-danger</p>
        <p class="text-warning bg-dark">.text-warning</p>
        <p class="text-info bg-dark">.text-info</p>
        <p class="text-light bg-dark">.text-light</p>
        <p class="text-dark">.text-dark</p>
        <p class="text-body">.text-body</p>
        <p class="text-muted">.text-muted</p>
        <p class="text-white bg-dark">.text-white</p>
        <p class="text-black-50">.text-black-50</p>
        <p class="text-white-50 bg-dark">.text-white-50</p>
Conveying meaning to assistive technologies

Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies – such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (e.g. the visible text), or is included through alternative means, such as additional text hidden with the .visually-hidden class.

处理特殊性

有时候情境色彩并无法套用在其他的提取器，解决方案是用一个div包装元素内容，并将class套用在上面。

Sass

除了下面的Sass功能外，请考虑阅读我们的CSS自定义属性（aka CSS variables）中包含的颜色等内容。

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

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

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

$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;

Map

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

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

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

$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
        );

Utilities API

Color utilities are declared in our utilities API in scss/_utilities.scss. 

    "color": (
        property: color,
        class: text,
        values: map-merge(
          $theme-colors,
          (
            "white": $white,
            "body": $body-color,
            "muted": $text-muted,
            "black-50": rgba($black, .5),
            "white-50": rgba($white, .5),
            "reset": inherit,
          )
        )
        ),
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