尺寸（Sizing）

使用寬度和高度通用類別，可以輕松地將一個元素加寬或增高。

On this page

相對于父元素

寬度和高度通用類別從_utilities.scss中產(chǎn)生。預(yù)設(shè)包含25%，50%，75%，100%和auto。按你的需求調(diào)整這些值，可產(chǎn)生不同的屬性。

Width 25%

Width 50%

Width 75%

Width 100%

Width auto

<div class="w-25 p-3" style="background-color: #eee;">Width 25%</div>
<div class="w-50 p-3" style="background-color: #eee;">Width 50%</div>
<div class="w-75 p-3" style="background-color: #eee;">Width 75%</div>
<div class="w-100 p-3" style="background-color: #eee;">Width 100%</div>
<div class="w-auto p-3" style="background-color: #eee;">Width auto</div>

Height 25%

Height 50%

Height 75%

Height 100%

Height auto

<div style="height: 100px; background-color: rgba(255,0,0,0.1);">
<div class="h-25 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 25%</div>
<div class="h-50 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 50%</div>
<div class="h-75 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 75%</div>
<div class="h-100 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 100%</div>
<div class="h-auto d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height auto</div>
</div>

您還可以根據(jù)需求使用max-width: 100%；和max-height: 100%；通用類別。

<img src="..." class="mw-100" alt="...">

Max-height 100%

<div style="height: 100px; background-color: rgba(255,0,0,.1);">
<div class="mh-100" style="width: 100px; height: 200px; background-color: rgba(0,0,255,.1);">Max-height 100%</div>
</div>

相對于視窗

您還可以使用通用類別來設(shè)定相對于視窗的寬度和高度。

<div class="min-vw-100">Min-width 100vw</div>
<div class="min-vh-100">Min-height 100vh</div>
<div class="vw-100">Width 100vw</div>
<div class="vh-100">Height 100vh</div>

Sass

Utilities API

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

    "width": (
property: width,
class: w,
values: (
  25: 25%,
  50: 50%,
  75: 75%,
  100: 100%,
  auto: auto
)
),
"max-width": (
property: max-width,
class: mw,
values: (100: 100%)
),
"viewport-width": (
property: width,
class: vw,
values: (100: 100vw)
),
"min-viewport-width": (
property: min-width,
class: min-vw,
values: (100: 100vw)
),
"height": (
property: height,
class: h,
values: (
  25: 25%,
  50: 50%,
  75: 75%,
  100: 100%,
  auto: auto
)
),
"max-height": (
property: max-height,
class: mh,
values: (100: 100%)
),
"viewport-height": (
property: height,
class: vh,
values: (100: 100vh)
),
"min-viewport-height": (
property: min-height,
class: min-vh,
values: (100: 100vh)
),