链接工具用于美化你的锚点，可以调整它们的颜色、不透明度、下划线偏移、下划线颜色等。
本页目录
链接不透明度
使用工具更改链接rgba()颜色值的 alpha 不透明度。请注意，更改颜色的不透明度可能导致链接具有不足的对比度。
<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>你甚至可以在悬停时更改不透明度级别。
<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
独立于链接文本颜色更改下划线的颜色。
<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。偏移量设置为em单位，以便自动随元素当前的font-size进行缩放。
<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。需要先添加 .link-underline 来设置我们用来修改 alpha 不透明度的 rgba() 颜色。
<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 工具，.link-offset 和 .link-underline-opacity 工具默认包含 :hover 变体。混合搭配以创建独特的链接样式。
<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
彩色链接辅助类 已更新以配合我们的链接工具类。使用新的工具类修改链接的不透明度、下划线的不透明度和下划线的偏移量。
<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>无障碍提示：仅使用颜色来增加意义只提供视觉提示，这对于使用辅助技术（如屏幕阅读器）的用户是无法传达的。请确保意义本身在内容中就显而易见（例如，可见文本通过 足够的颜色对比）或者通过其他方式包含，例如使用 .visually-hidden 类隐藏的额外文本。
CSS
除了以下的 Sass 功能之外，还可以考虑阅读我们包含的 CSS 自定义属性（即 CSS 变量）以了解颜色和更多内容。
Sass 工具 API
链接工具在我们的工具类 API 中的 scss/_utilities.scss 中声明。了解如何使用工具类 API。
"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
),
),