--- title: flex-shrink slug: Web/CSS/flex-shrink tags: - CSS - CSS Property - CSS 属性 - Reference - 参考 - 弹性盒 translation_of: Web/CSS/flex-shrink ---
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CSS flex-shrink 属性指定了 flex 元素的收缩规则。flex 元素仅在默认宽度之和大于容器的时候才会发生收缩，其收缩的大小是依据 flex-shrink 的值。

flex-shrink: 2;
flex-shrink: 0.6;

/* Global values */
flex-shrink: inherit;
flex-shrink: initial;
flex-shrink: unset

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更多属性和定义请参见使用 CSS 弹性盒子

语法

flex-shrink 属性只能是一个 <number>。

取值

<number>
负值是不被允许的。参考 {{cssxref("<number>")}}。

Formal syntax

{{csssyntax}}

示例

HTML

<p>the width of content is 500px, flex-basic of flex item is 120px.</p>
<p>A, B, C are flex-shrink:1. D and E are flex-shrink:2</p>
<p>the width of D is not the same as A's</p>
<div id="content">
  <div class="box" style="background-color:red;">A</div>
  <div class="box" style="background-color:lightblue;">B</div>
  <div class="box" style="background-color:yellow;">C</div>
  <div class="box1" style="background-color:brown;">D</div>
  <div class="box1" style="background-color:lightgreen;">E</div>
</div>

CSS

#content {
  display: flex;
  width: 500px;
}

#content div {
  flex-basis: 120px;
  border: 3px solid rgba(0,0,0,.2);
}

.box {
  flex-shrink: 1;
}

.box1 {
  flex-shrink: 2;
}

结果

{{EmbedLiveSample('示例', '500px', '300px', '', 'Web/CSS/flex-shrink')}}

规范

Specification Status Comment
{{ SpecName('CSS3 Flexbox', '#flex-shrink', 'flex-shrink') }} {{ Spec2('CSS3 Flexbox') }}  

浏览器兼容性

{{ CompatibilityTable() }}

Feature Firefox (Gecko) Chrome Edge Internet Explorer Opera Safari
Basic support {{CompatGeckoDesktop("18.0")}}[1]
{{CompatGeckoDesktop("32.0")}}[2]		 21.0{{property_prefix("-webkit")}} {{CompatVersionUnknown}}{{property_prefix("-webkit")}}
{{CompatVersionUnknown}}		 10[3] 12.10 8.0{{property_prefix("-webkit")}}
Feature Firefox Mobile (Gecko) Android Edge IE Phone Opera Mobile Safari Mobile
Basic support {{CompatGeckoMobile("18.0")}}[1]
{{CompatGeckoMobile("32.0")}}[2]		 {{CompatUnknown}} {{CompatVersionUnknown}}{{property_prefix("-webkit")}}
{{CompatVersionUnknown}}		 {{CompatNo}} 12.10 {{CompatNo}}

[1] Firefox 仅支持单行 flexbox 直到 Firefox 28版本。To activate flexbox support, for Firefox 18 and 19, the user has to change the about:config preference "layout.css.flexbox.enabled" to true.

In addition to the unprefixed support, Gecko 48.0 {{geckoRelease("48.0")}} added support for a -webkit prefixed version of the property for web compatibility reasons behind the preference layout.css.prefixes.webkit, defaulting to false. Since Gecko 49.0 {{geckoRelease("49.0")}} the preference defaults to true.

[2] 在 Firefox 32 之前，Gecko不能将动画从0开始或停止在0(Spec,Demo).。

[3] Internet Explorer 10 使用 0 而不是 1 作为 flex-shrink 属性的初始值。A workaround is to always set an explicit value for flex-shrink. See Flexbug #6 for more info.

参考