使用这些速记实用程序快速配置元素的位置。
仓位值
快速定位类可用，但它们没有响应能力。
<div class="position-static">...</div>
<div class="position-relative">...</div>
<div class="position-absolute">...</div>
<div class="position-fixed">...</div>
<div class="position-sticky">...</div>
排列元素
使用边缘定位实用程序轻松排列元素。格式为 。{property}-{position}
其中财产是以下之一：
top– 对于垂直位置topstart– 对于水平位置（以 LTR 为单位）leftbottom– 对于垂直位置bottomend– 对于水平位置（以 LTR 为单位）right
其中 position 是以下之一：
0– 用于边缘位置050– 用于边缘位置50%100– 用于边缘位置100%
（您可以通过向 Sass 映射变量添加条目来添加更多位置值。$position-values
<div class="position-relative">
<div class="position-absolute top-0 start-0"></div>
<div class="position-absolute top-0 end-0"></div>
<div class="position-absolute top-50 start-50"></div>
<div class="position-absolute bottom-50 end-50"></div>
<div class="position-absolute bottom-0 start-0"></div>
<div class="position-absolute bottom-0 end-0"></div>
</div>中心元素
此外，您还可以使用 transform 实用程序类将元素居中。.translate-middle
此类将变换 和 应用于元素，与边缘定位实用程序相结合，允许您绝对居中元素。translateX(-50%)translateY(-50%)
<div class="position-relative">
<div class="position-absolute top-0 start-0 translate-middle"></div>
<div class="position-absolute top-0 start-50 translate-middle"></div>
<div class="position-absolute top-0 start-100 translate-middle"></div>
<div class="position-absolute top-50 start-0 translate-middle"></div>
<div class="position-absolute top-50 start-50 translate-middle"></div>
<div class="position-absolute top-50 start-100 translate-middle"></div>
<div class="position-absolute top-100 start-0 translate-middle"></div>
<div class="position-absolute top-100 start-50 translate-middle"></div>
<div class="position-absolute top-100 start-100 translate-middle"></div>
</div>通过添加 or 类，元素只能在水平或垂直方向上定位。.translate-middle-x.translate-middle-y
<div class="position-relative">
<div class="position-absolute top-0 start-0"></div>
<div class="position-absolute top-0 start-50 translate-middle-x"></div>
<div class="position-absolute top-0 end-0"></div>
<div class="position-absolute top-50 start-0 translate-middle-y"></div>
<div class="position-absolute top-50 start-50 translate-middle"></div>
<div class="position-absolute top-50 end-0 translate-middle-y"></div>
<div class="position-absolute bottom-0 start-0"></div>
<div class="position-absolute bottom-0 start-50 translate-middle-x"></div>
<div class="position-absolute bottom-0 end-0"></div>
</div>例子
以下是这些课程的一些现实生活中的例子：
标记
<button type="button" class="btn btn-primary position-relative">
Mails <span class="position-absolute top-0 start-100 translate-middle badge rounded-pill text-bg-secondary">+99 <span class="visually-hidden">unread messages</span></span>
</button>
<div class="position-relative py-2 px-4 text-bg-secondary border border-secondary rounded-pill">
Marker <svg width="1em" height="1em" viewBox="0 0 16 16" class="position-absolute top-100 start-50 translate-middle mt-1" fill="var(--bs-secondary)" xmlns="http://www.w3.org/2000/svg" aria-hidden="true"><path d="M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z"/></svg>
</div>
<button type="button" class="btn btn-primary position-relative">
Alerts <span class="position-absolute top-0 start-100 translate-middle badge border border-light rounded-circle bg-danger p-2"><span class="visually-hidden">unread messages</span></span>
</button>您可以将这些类与现有组件一起使用以创建新组件。请记住，您可以通过向变量添加条目来扩展其功能。$position-values
<div class="position-relative m-4">
<div class="progress" role="progressbar" aria-label="Progress" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100" style="height: 1px;">
<div class="progress-bar" style="width: 50%"></div>
</div>
<button type="button" class="position-absolute top-0 start-0 translate-middle btn btn-sm btn-primary rounded-pill" style="width: 2rem; height:2rem;">1</button>
<button type="button" class="position-absolute top-0 start-50 translate-middle btn btn-sm btn-primary rounded-pill" style="width: 2rem; height:2rem;">2</button>
<button type="button" class="position-absolute top-0 start-100 translate-middle btn btn-sm btn-secondary rounded-pill" style="width: 2rem; height:2rem;">3</button>
</div>CSS系统
萨斯地图
默认位置实用程序值在 Sass 映射中声明，然后用于生成我们的实用程序。
$position-values: (
0: 0,
50: 50%,
100: 100%
);
Sass 实用程序 API
位置实用程序在我们的实用程序 API 中声明。了解如何使用实用工具 API。scss/_utilities.scss
"position": (
property: position,
values: static relative absolute fixed sticky
),
"top": (
property: top,
values: $position-values
),
"bottom": (
property: bottom,
values: $position-values
),
"start": (
property: left,
class: start,
values: $position-values
),
"end": (
property: right,
class: end,
values: $position-values
),
"translate-middle": (
property: transform,
class: translate-middle,
values: (
null: translate(-50%, -50%),
x: translateX(-50%),
y: translateY(-50%),
)
),