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Borders边框

Use border utilities to quickly style the border and border-radius of an element. 使用边框实用程序快速设置元素的边框和边框半径的样式。Great for images, buttons, or any other element.适用于图像、按钮或任何其他元素。

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Border边框

Use border utilities to add or remove an element’s borders. Choose from all borders or one at a time.使用边框实用程序添加或删除元素的边框。从所有边界中选择，或一次选择一个边界。

Additive加法

<span class="border"></span>
<span class="border-top"></span>
<span class="border-end"></span>
<span class="border-bottom"></span>
<span class="border-start"></span>

Subtractive减法

<span class="border-0"></span>
<span class="border-top-0"></span>
<span class="border-end-0"></span>
<span class="border-bottom-0"></span>
<span class="border-start-0"></span>

Border color边框颜色

Change the border color using utilities built on our theme colors.使用基于主题颜色构建的实用程序更改边框颜色。

<span class="border border-primary"></span>
<span class="border border-secondary"></span>
<span class="border border-success"></span>
<span class="border border-danger"></span>
<span class="border border-warning"></span>
<span class="border border-info"></span>
<span class="border border-light"></span>
<span class="border border-dark"></span>
<span class="border border-white"></span>

Border-width边框宽度

<span class="border border-1"></span>
<span class="border border-2"></span>
<span class="border border-3"></span>
<span class="border border-4"></span>
<span class="border border-5"></span>

Border-radius边框半径

Add classes to an element to easily round its corners.将类添加到元素中，以轻松地圆角。

Example rounded image75x75 Example top rounded image75x75 Example right rounded image75x75 Example bottom rounded image75x75 Example left rounded image75x75 Completely round image75x75 Rounded pill image150x75 
<img src="..." class="rounded" alt="...">
<img src="..." class="rounded-top" alt="...">
<img src="..." class="rounded-end" alt="...">
<img src="..." class="rounded-bottom" alt="...">
<img src="..." class="rounded-start" alt="...">
<img src="..." class="rounded-circle" alt="...">
<img src="..." class="rounded-pill" alt="...">

Sizes尺寸

Use the scaling classes for larger or smaller rounded corners. 对于较大或较小的圆角使用缩放类。Sizes range from 0 to 3, and can be configured by modifying the utilities API.大小范围从0到3，可以通过修改实用程序API进行配置。

Example non-rounded image75x75 Example small rounded image75x75 Example default rounded image75x75 Example large rounded image75x75 
<img src="..." class="rounded-0" alt="...">
<img src="..." class="rounded-1" alt="...">
<img src="..." class="rounded-2" alt="...">
<img src="..." class="rounded-3" alt="...">

Sass

Variables变量

$border-width:                1px;
$border-widths: (
1: 1px,
2: 2px,
3: 3px,
4: 4px,
5: 5px
);
$border-color:                $gray-300;

$border-radius:               .25rem;
$border-radius-sm:            .2rem;
$border-radius-lg:            .3rem;
$border-radius-pill:          50rem;

Mixins

@mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
@if $enable-rounded {
border-radius: valid-radius($radius);
}
@else if $fallback-border-radius != false {
border-radius: $fallback-border-radius;
}
}
@mixin border-top-radius($radius: $border-radius) {
@if $enable-rounded {
border-top-left-radius: valid-radius($radius);
border-top-right-radius: valid-radius($radius);
}
}
@mixin border-end-radius($radius: $border-radius) {
@if $enable-rounded {
border-top-right-radius: valid-radius($radius);
border-bottom-right-radius: valid-radius($radius);
}
}
@mixin border-bottom-radius($radius: $border-radius) {
@if $enable-rounded {
border-bottom-right-radius: valid-radius($radius);
border-bottom-left-radius: valid-radius($radius);
}
}
@mixin border-start-radius($radius: $border-radius) {
@if $enable-rounded {
border-top-left-radius: valid-radius($radius);
border-bottom-left-radius: valid-radius($radius);
}
}
@mixin border-top-start-radius($radius: $border-radius) {
@if $enable-rounded {
border-top-left-radius: valid-radius($radius);
}
}
@mixin border-top-end-radius($radius: $border-radius) {
@if $enable-rounded {
border-top-right-radius: valid-radius($radius);
}
}
@mixin border-bottom-end-radius($radius: $border-radius) {
@if $enable-rounded {
border-bottom-right-radius: valid-radius($radius);
}
}
@mixin border-bottom-start-radius($radius: $border-radius) {
@if $enable-rounded {
border-bottom-left-radius: valid-radius($radius);
}
}

Utilities API实用程序API

Border utilities are declared in our utilities API in scss/_utilities.scss. 边界实用程序在scss/_utilities.scss中的实用程序API中声明。Learn how to use the utilities API.

    "border": (
property: border,
values: (
null: $border-width solid $border-color,
0: 0,
)
),
"border-top": (
property: border-top,
values: (
null: $border-width solid $border-color,
0: 0,
)
),
"border-end": (
property: border-right,
class: border-end,
values: (
null: $border-width solid $border-color,
0: 0,
)
),
"border-bottom": (
property: border-bottom,
values: (
null: $border-width solid $border-color,
0: 0,
)
),
"border-start": (
property: border-left,
class: border-start,
values: (
null: $border-width solid $border-color,
0: 0,
)
),
"border-color": (
property: border-color,
class: border,
values: map-merge($theme-colors, ("white": $white))
),
"border-width": (
property: border-width,
class: border,
values: $border-widths
),

    "rounded": (
property: border-radius,
class: rounded,
values: (
null: $border-radius,
0: 0,
1: $border-radius-sm,
2: $border-radius,
3: $border-radius-lg,
circle: 50%,
pill: $border-radius-pill
)
),
"rounded-top": (
property: border-top-left-radius border-top-right-radius,
class: rounded-top,
values: (null: $border-radius)
),
"rounded-end": (
property: border-top-right-radius border-bottom-right-radius,
class: rounded-end,
values: (null: $border-radius)
),
"rounded-bottom": (
property: border-bottom-right-radius border-bottom-left-radius,
class: rounded-bottom,
values: (null: $border-radius)
),
"rounded-start": (
property: border-bottom-left-radius border-top-left-radius,
class: rounded-start,
values: (null: $border-radius)
),