Position位置
Use these shorthand utilities for quickly configuring the position of an element.使用这些速记实用程序快速配置元素的位置。
Position values位置值
Quick positioning classes are available, though they are not responsive.快速定位课程是可用的，尽管它们没有响应能力。
<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>
Arrange elements排列元素
Arrange elements easily with the edge positioning utilities. 使用边缘定位实用程序轻松排列元素。The format is 格式为{property}-{position}.{property}-{position}。
Where property is one of:如果property是以下之一：
top-for the vertical用于垂直toppositiontop位置start-for the horizontal用于水平leftposition (in LTR)left位置（LTR）bottom-for the vertical用于垂直bottompositionbottom位置end-for the horizontal用于水平rightposition (in LTR)right位置（LTR）
Where position is one of:其中position为：
0-for用于0edge position0边缘位置50-for用于50%edge position50%边缘位置100-for用于100%edge position100%边缘位置
(You can add more position values by adding entries to the （您可以通过向$position-values Sass map variable.)$position-values-Sass映射变量添加条目来添加更多位置值。）
<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>Center elements中心元素
In addition, you can also center the elements with the transform utility class 此外，还可以使用转换工具类.translate-middle..translate-middle将元素居中。
This class applies the transformations 该类将translateX(-50%) and translateY(-50%) to the element which, in combination with the edge positioning utilities, allows you to absolute center an element.translateX(-50%)和translateY(-50%)转换应用于元素，结合边缘定位实用程序，可以将元素绝对居中。
<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>By adding 通过添加.translate-middle-x or .translate-middle-y classes, elements can be positioned only in horizontal or vertical direction..translate-middle-x或.translate-middle-y类，元素只能在水平或垂直方向上定位。
<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>Examples示例
Here are some real life examples of these classes:下面是这些类的一些真实例子：
<button type="button" class="btn btn-primary position-relative">
Mails <span class="position-absolute top-0 start-100 translate-middle badge rounded-pill bg-secondary">+99 <span class="visually-hidden">unread messages</span></span>
</button>
<button type="button" class="btn btn-dark position-relative">
Marker <svg width="1em" height="1em" viewBox="0 0 16 16" class="position-absolute top-100 start-50 translate-middle mt-1 bi bi-caret-down-fill" fill="#212529" xmlns="http://www.w3.org/2000/svg"><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>
</button>
<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>You can use these classes with existing components to create new ones. 您可以将这些类与现有组件一起使用来创建新组件。Remember that you can extend its functionality by adding entries to the 请记住，您可以通过向$position-values variable.$position-values变量添加条目来扩展其功能。
<div class="position-relative m-4">
<div class="progress" style="height: 1px;">
<div class="progress-bar" role="progressbar" style="width: 50%;" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></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>Sass
Maps
Default position utility values are declared in a Sass map, then used to generate our utilities.默认位置实用程序值在Sass映射中声明，然后用于生成实用程序。
$position-values: (
0: 0,
50: 50%,
100: 100%
);
Utilities API实用程序API
Position utilities are declared in our utilities API in 位置实用程序在scss/_utilities.scss. scss/_utilities.scss中的实用程序API中声明。Learn how to use the utilities API.了解如何使用实用程序API。
"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%),
)
),