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弹性 | Flex

使用一整套响应式Flexbox实用程序快速管理网格列,导航,组件等的布局,对齐和大小。对于更复杂的实现,可能需要自定义CSS。

启用柔性行为

应用display实用程序创建一个flexbox容器并将直接的子元素转换为flex项目。Flex容器和项目可以通过额外的flex属性进一步修改。

代码语言:javascript
复制
<div class="d-flex p-2">I'm a flexbox container!</div>
代码语言:javascript
复制
<div class="d-inline-flex p-2">I'm an inline flexbox container!</div>

响应变化也存在.d-flex.d-inline-flex

  • .d-flex
  • .d-inline-flex
  • .d-sm-flex
  • .d-sm-inline-flex
  • .d-md-flex
  • .d-md-inline-flex
  • .d-lg-flex
  • .d-lg-inline-flex
  • .d-xl-flex
  • .d-xl-inline-flex

方向

使用方向工具在柔性容器中设置柔性物品的方向。在大多数情况下,您可以省略浏览器默认的水平类row。但是,您可能会遇到需要明确设置此值的情况(如响应式布局)。

使用.flex-row设置在水平方向(在浏览器默认值),或者.flex-row-reverse开始从相对侧上的水平方向上。

代码语言:javascript
复制
<div class="d-flex flex-row">
  <div class="p-2">Flex item 1</div>
  <div class="p-2">Flex item 2</div>
  <div class="p-2">Flex item 3</div>
</div>
<div class="d-flex flex-row-reverse">
  <div class="p-2">Flex item 1</div>
  <div class="p-2">Flex item 2</div>
  <div class="p-2">Flex item 3</div>
</div>

使用.flex-column设定垂直方向,或者.flex-column-reverse开始从相对侧上的垂直方向。

代码语言:javascript
复制
<div class="d-flex flex-column">
  <div class="p-2">Flex item 1</div>
  <div class="p-2">Flex item 2</div>
  <div class="p-2">Flex item 3</div>
</div>
<div class="d-flex flex-column-reverse">
  <div class="p-2">Flex item 1</div>
  <div class="p-2">Flex item 2</div>
  <div class="p-2">Flex item 3</div>
</div>

响应变化也存在flex-direction

  • .flex-row
  • .flex-row-reverse
  • .flex-column
  • .flex-column-reverse
  • .flex-sm-row
  • .flex-sm-row-reverse
  • .flex-sm-column
  • .flex-sm-column-reverse
  • .flex-md-row
  • .flex-md-row-reverse
  • .flex-md-column
  • .flex-md-column-reverse
  • .flex-lg-row
  • .flex-lg-row-reverse
  • .flex-lg-column
  • .flex-lg-column-reverse
  • .flex-xl-row
  • .flex-xl-row-reverse
  • .flex-xl-column
  • .flex-xl-column-reverse

对齐内容

justify-content在flexbox容器上使用实用程序来更改主轴上的flex项目的对齐方式(x轴开始,y轴为if flex-direction: column)。选择start(浏览器的默认),endcenterbetweenaround

代码语言:javascript
复制
<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>

响应变化也存在justify-content

  • .justify-content-start
  • .justify-content-end
  • .justify-content-center
  • .justify-content-between
  • .justify-content-around
  • .justify-content-sm-start
  • .justify-content-sm-end
  • .justify-content-sm-center
  • .justify-content-sm-between
  • .justify-content-sm-around
  • .justify-content-md-start
  • .justify-content-md-end
  • .justify-content-md-center
  • .justify-content-md-between
  • .justify-content-md-around
  • .justify-content-lg-start
  • .justify-content-lg-end
  • .justify-content-lg-center
  • .justify-content-lg-between
  • .justify-content-lg-around
  • .justify-content-xl-start
  • .justify-content-xl-end
  • .justify-content-xl-center
  • .justify-content-xl-between
  • .justify-content-xl-around

对齐项目

align-items在flexbox容器上使用实用程序来更改横轴上的flex项目的对齐方式(y轴为开始,x轴为if flex-direction: column)。选择startendcenterbaseline,或者stretch(默认浏览器)。

代码语言:javascript
复制
<div class="d-flex align-items-start">...</div>
<div class="d-flex align-items-end">...</div>
<div class="d-flex align-items-center">...</div>
<div class="d-flex align-items-baseline">...</div>
<div class="d-flex align-items-stretch">...</div>

响应变化也存在align-items

  • .align-items-start
  • .align-items-end
  • .align-items-center
  • .align-items-baseline
  • .align-items-stretch
  • .align-items-sm-start
  • .align-items-sm-end
  • .align-items-sm-center
  • .align-items-sm-baseline
  • .align-items-sm-stretch
  • .align-items-md-start
  • .align-items-md-end
  • .align-items-md-center
  • .align-items-md-baseline
  • .align-items-md-stretch
  • .align-items-lg-start
  • .align-items-lg-end
  • .align-items-lg-center
  • .align-items-lg-baseline
  • .align-items-lg-stretch
  • .align-items-xl-start
  • .align-items-xl-end
  • .align-items-xl-center
  • .align-items-xl-baseline
  • .align-items-xl-stretch

对齐self

align-self在Flexbox项目上使用实用程序来单独更改交叉轴上的对齐方式(要开始的是y轴,如果是x轴flex-direction: column)。选择相同的选项align-itemsstartendcenterbaseline,或者stretch(默认浏览器)。

代码语言:javascript
复制
<div class="align-self-start">Aligned flex item</div>
<div class="align-self-end">Aligned flex item</div>
<div class="align-self-center">Aligned flex item</div>
<div class="align-self-baseline">Aligned flex item</div>
<div class="align-self-stretch">Aligned flex item</div>

响应变化也存在align-self

  • .align-self-start
  • .align-self-end
  • .align-self-center
  • .align-self-baseline
  • .align-self-stretch
  • .align-self-sm-start
  • .align-self-sm-end
  • .align-self-sm-center
  • .align-self-sm-baseline
  • .align-self-sm-stretch
  • .align-self-md-start
  • .align-self-md-end
  • .align-self-md-center
  • .align-self-md-baseline
  • .align-self-md-stretch
  • .align-self-lg-start
  • .align-self-lg-end
  • .align-self-lg-center
  • .align-self-lg-baseline
  • .align-self-lg-stretch
  • .align-self-xl-start
  • .align-self-xl-end
  • .align-self-xl-center
  • .align-self-xl-baseline
  • .align-self-xl-stretch

自动边距

将Flex对齐与自动边距混合时,Flexbox可以做一些非常棒的事情。下面显示的是通过自动边距控制弹性项目的三个示例:默认(无自动边距),将两个项目向右推(.mr-auto),并将两个项目向左推(.ml-auto)。

不幸的是,IE10和IE11不能正确支持父项具有非默认 justify-content 值的弹性项目上的自动边距。有关更多详细信息,请参阅此StackOverflow answer

代码语言:javascript
复制
<div class="d-flex">
  <div class="p-2">Flex item</div>
  <div class="p-2">Flex item</div>
  <div class="p-2">Flex item</div>
</div>

<div class="d-flex">
  <div class="mr-auto p-2">Flex item</div>
  <div class="p-2">Flex item</div>
  <div class="p-2">Flex item</div>
</div>

<div class="d-flex">
  <div class="p-2">Flex item</div>
  <div class="p-2">Flex item</div>
  <div class="ml-auto p-2">Flex item</div>
</div>

与对齐项

通过混合align-itemsflex-direction: columnmargin-top: automargin-bottom: auto,将一个Flex项目垂直移动到容器的顶部或底部。

代码语言:javascript
复制
<div class="d-flex align-items-start flex-column" style="height: 200px;">
  <div class="mb-auto p-2">Flex item</div>
  <div class="p-2">Flex item</div>
  <div class="p-2">Flex item</div>
</div>

<div class="d-flex align-items-end flex-column" style="height: 200px;">
  <div class="p-2">Flex item</div>
  <div class="p-2">Flex item</div>
  <div class="mt-auto p-2">Flex item</div>
</div>

更改FLEX项在FLEX容器中的包装方式。从没有包装(浏览器默认)中选择.flex-nowrap,用.flex-wrap包装或反向包装.flex-wrap-reverse

代码语言:javascript
复制
<div class="d-flex flex-nowrap">
  ...
</div>
代码语言:javascript
复制
<div class="d-flex flex-wrap">
  ...
</div>
代码语言:javascript
复制
<div class="d-flex flex-wrap-reverse">
  ...
</div>

响应变化也存在flex-wrap

  • .flex-nowrap
  • .flex-wrap
  • .flex-wrap-reverse
  • .flex-sm-nowrap
  • .flex-sm-wrap
  • .flex-sm-wrap-reverse
  • .flex-md-nowrap
  • .flex-md-wrap
  • .flex-md-wrap-reverse
  • .flex-lg-nowrap
  • .flex-lg-wrap
  • .flex-lg-wrap-reverse
  • .flex-xl-nowrap
  • .flex-xl-wrap
  • .flex-xl-wrap-reverse

命令

使用少数实用程序更改特定弹性项目的可视顺序order。我们只提供制作项目的首选或最后选项,以及重置使用DOM订单。正如 order采用任何整数值(例如5),为所需的任何附加值添加自定义CSS。

代码语言:javascript
复制
<div class="d-flex flex-nowrap">
  <div class="order-3 p-2">First flex item</div>
  <div class="order-2 p-2">Second flex item</div>
  <div class="order-1 p-2">Third flex item</div>
</div>

响应变化也存在order

  • .order-1
  • .order-2
  • .order-3
  • .order-4
  • .order-5
  • .order-6
  • .order-7
  • .order-8
  • .order-9
  • .order-10
  • .order-11
  • .order-12
  • .order-sm-1
  • .order-sm-2
  • .order-sm-3
  • .order-sm-4
  • .order-sm-5
  • .order-sm-6
  • .order-sm-7
  • .order-sm-8
  • .order-sm-9
  • .order-sm-10
  • .order-sm-11
  • .order-sm-12
  • .order-md-1
  • .order-md-2
  • .order-md-3
  • .order-md-4
  • .order-md-5
  • .order-md-6
  • .order-md-7
  • .order-md-8
  • .order-md-9
  • .order-md-10
  • .order-md-11
  • .order-md-12
  • .order-lg-1
  • .order-lg-2
  • .order-lg-3
  • .order-lg-4
  • .order-lg-5
  • .order-lg-6
  • .order-lg-7
  • .order-lg-8
  • .order-lg-9
  • .order-lg-10
  • .order-lg-11
  • .order-lg-12
  • .order-xl-1
  • .order-xl-2
  • .order-xl-3
  • .order-xl-4
  • .order-xl-5
  • .order-xl-6
  • .order-xl-7
  • .order-xl-8
  • .order-xl-9
  • .order-xl-10
  • .order-xl-11
  • .order-xl-12

对齐内容

使用align-contentFlexbox容器上的实用工具将交叉轴上的Flex项目对齐在一起。选择start(浏览器的默认),endcenterbetweenaroundstretch。为了演示这些实用程序,我们已经实施flex-wrap: wrap并增加了弹性项目的数量。

提提%21此属性对单行FLEX项没有影响。

代码语言:javascript
复制
<div class="d-flex align-content-start flex-wrap">
  ...
</div>
代码语言:javascript
复制
<div class="d-flex align-content-end flex-wrap">...</div>
代码语言:javascript
复制
<div class="d-flex align-content-center flex-wrap">...</div>
代码语言:javascript
复制
<div class="d-flex align-content-between flex-wrap">...</div>
代码语言:javascript
复制
<div class="d-flex align-content-around flex-wrap">...</div>
代码语言:javascript
复制
<div class="d-flex align-content-stretch flex-wrap">...</div>

响应变化也存在align-content

  • .align-content-start
  • .align-content-end
  • .align-content-center
  • .align-content-around
  • .align-content-stretch
  • .align-content-sm-start
  • .align-content-sm-end
  • .align-content-sm-center
  • .align-content-sm-around
  • .align-content-sm-stretch
  • .align-content-md-start
  • .align-content-md-end
  • .align-content-md-center
  • .align-content-md-around
  • .align-content-md-stretch
  • .align-content-lg-start
  • .align-content-lg-end
  • .align-content-lg-center
  • .align-content-lg-around
  • .align-content-lg-stretch
  • .align-content-xl-start
  • .align-content-xl-end
  • .align-content-xl-center
  • .align-content-xl-around
  • .align-content-xl-stretch

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