尺寸（Sizing）

使用宽度和高度通用类别，可以轻松地将一个元素加宽或增高。

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相对于父元素

宽度和高度通用类别从_utilities.scss中产生。预设包含25%，50%，75%，100%和auto。按你的需求调整这些值，可产生不同的属性。

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>

您还可以根据需求使用max-width: 100%；和max-height: 100%；通用类别。

Placeholder Max-width 100% 
<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>

相对于视窗

您还可以使用通用类别来设定相对于视窗的宽度和高度。

<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)
        ),
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