Added in v5.3 View on GitHub

Link

Link utilities用于设置锚点的样式，以调整其颜色、不透明度、下划线偏移、下划线颜色等。

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链接不透明度

使用实用程序更改链接rgba()颜色值的alpha不透明度。请注意，更改颜色的不透明度可能会导致链接具有insufficient contrast。

html

<p><a class="link-opacity-10" href="#">Link opacity 10</a></p>
<p><a class="link-opacity-25" href="#">Link opacity 25</a></p>
<p><a class="link-opacity-50" href="#">Link opacity 50</a></p>
<p><a class="link-opacity-75" href="#">Link opacity 75</a></p>
<p><a class="link-opacity-100" href="#">Link opacity 100</a></p>

您甚至可以在悬停时更改不透明度级别。

Link hover opacity 10

Link hover opacity 25

Link hover opacity 50

Link hover opacity 75

Link hover opacity 100

html

<p><a class="link-opacity-10-hover" href="#">Link hover opacity 10</a></p>
<p><a class="link-opacity-25-hover" href="#">Link hover opacity 25</a></p>
<p><a class="link-opacity-50-hover" href="#">Link hover opacity 50</a></p>
<p><a class="link-opacity-75-hover" href="#">Link hover opacity 75</a></p>
<p><a class="link-opacity-100-hover" href="#">Link hover opacity 100</a></p>

链接下划线

下划线颜色

独立于链接文本的颜色更改下划线的颜色。

html

<p><a href="#" class="link-underline-primary">Primary underline</a></p>
<p><a href="#" class="link-underline-secondary">Secondary underline</a></p>
<p><a href="#" class="link-underline-success">Success underline</a></p>
<p><a href="#" class="link-underline-danger">Danger underline</a></p>
<p><a href="#" class="link-underline-warning">Warning underline</a></p>
<p><a href="#" class="link-underline-info">Info underline</a></p>
<p><a href="#" class="link-underline-light">Light underline</a></p>
<p><a href="#" class="link-underline-dark">Dark underline</a></p>

下划线偏移

更改下划线与文本的距离。偏移量以em为单位设置，以自动按元素当前的font-size缩放。

html

<p><a href="#">Default link</a></p>
<p><a class="link-offset-1" href="#">Offset 1 link</a></p>
<p><a class="link-offset-2" href="#">Offset 2 link</a></p>
<p><a class="link-offset-3" href="#">Offset 3 link</a></p>

下划线不透明度

更改下划线的不透明度。需要添加link-underline以首先设置用于修改alpha不透明度的rgba()颜色。

Underline opacity 100

html

<p><a class="link-offset-2 link-underline link-underline-opacity-0" href="#">Underline opacity 0</a></p>
<p><a class="link-offset-2 link-underline link-underline-opacity-10" href="#">Underline opacity 10</a></p>
<p><a class="link-offset-2 link-underline link-underline-opacity-25" href="#">Underline opacity 25</a></p>
<p><a class="link-offset-2 link-underline link-underline-opacity-50" href="#">Underline opacity 50</a></p>
<p><a class="link-offset-2 link-underline link-underline-opacity-75" href="#">Underline opacity 75</a></p>
<p><a class="link-offset-2 link-underline link-underline-opacity-100" href="#">Underline opacity 100</a></p>

悬停变体

就像.link-opacity-*-hover utilities一样，.link-offset和.link-underline-opacityutilities 默认包括:hover变体。可通过Mix，打造独特的链接风格。

Underline opacity 0

html

<a class="link-offset-2 link-offset-3-hover link-underline link-underline-opacity-0 link-underline-opacity-75-hover" href="#">
  Underline opacity 0
</a>

彩色链接

Colored link helpers 已更新为与我们的链接utilities配对。使用新utilities可以修改链接不透明度、下划线不透明度和下划线偏移量。

html

<p><a href="#" class="link-primary link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Primary link</a></p>
<p><a href="#" class="link-secondary link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Secondary link</a></p>
<p><a href="#" class="link-success link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Success link</a></p>
<p><a href="#" class="link-danger link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Danger link</a></p>
<p><a href="#" class="link-warning link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Warning link</a></p>
<p><a href="#" class="link-info link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Info link</a></p>
<p><a href="#" class="link-light link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Light link</a></p>
<p><a href="#" class="link-dark link-offset-2 link-underline-opacity-25 link-underline-opacity-100-hover">Dark link</a></p>
<p><a href="#" class="link-body-emphasis link-offset-2 link-underline-opacity-25 link-underline-opacity-75-hover">Emphasis link</a></p>

**无障碍可访问性提示：**使用颜色来增加意义只提供了一种视觉指示，而不会传达给屏幕阅读器等辅助技术的用户。请确保其含义从内容本身来看是显而易见的(例如，具有足够颜色对比度)，或者通过其他方式包含，例如使用.visually-hidden类隐藏的其他文本。

CSS

除了以下Sass功能外，还可以考虑阅读我们包含的CSS自定义属性 (即CSS variables) 中的颜色和其他内容。

Sass utilities API

链接实用程序在我们的utilities API中声明为scss/_utilities.scss。了解如何使用实用程序API。

scss/_utilities.scss

"link-opacity": (
  css-var: true,
  class: link-opacity,
  state: hover,
  values: (
    10: .1,
    25: .25,
    50: .5,
    75: .75,
    100: 1
  )
),
"link-offset": (
  property: text-underline-offset,
  class: link-offset,
  state: hover,
  values: (
    1: .125em,
    2: .25em,
    3: .375em,
  )
),
"link-underline": (
  property: text-decoration-color,
  class: link-underline,
  local-vars: (
    "link-underline-opacity": 1
  ),
  values: map-merge(
    $utilities-links-underline,
    (
      null: rgba(var(--#{$prefix}link-color-rgb), var(--#{$prefix}link-underline-opacity, 1)),
    )
  )
),
"link-underline-opacity": (
  css-var: true,
  class: link-underline-opacity,
  state: hover,
  values: (
    0: 0,
    10: .1,
    25: .25,
    50: .5,
    75: .75,
    100: 1
  ),
),