邊框（Borders）

使用Border通用類別迅速設計一個元素的border和border-radius。可用于圖象、按鈕、或任何其它元素。

On this page

邊框

使用border通用類別增加或移除一個元素的border。選擇要四邊都使用，或是一次只用一個。

增加

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

減少

<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>

邊框顏色

透過通用類別套用邊框的主題色彩。

<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>

邊框寬度

<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>

邊框半徑

將元素加入至class可以輕松地替邊框增加圓角。

<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="...">

尺寸

使用縮放的class將圓角放大或縮小。尺寸的范圍為0到3，可以透過通用類別的API進行配置。

<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

$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

Border utilities are declared in our utilities API in scss/_utilities.scss.

    "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)
),