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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

适用元素flex items, including in-flow pseudo-elements
计算值as specified
Animation typea number
正规顺序the unique non-ambiguous order defined by the formal grammar

更多属性和定义请参见使用 CSS 弹性盒子


flex-shrink 属性只能是一个 <number>


负值是不被允许的。参考 <number>

Formal syntax




<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>


#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; 



Specification Status Comment
CSS Flexible Box Layout Module
Candidate Recommendation  


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Feature Firefox (Gecko) Chrome Edge Internet Explorer Opera Safari
Basic support 18.0 (18.0)[1]
32.0 (32.0)[2]
21.0-webkit (Yes)-webkit
10[3] 12.10 8.0-webkit
Feature Firefox Mobile (Gecko) Android Edge IE Phone Opera Mobile Safari Mobile
Basic support 18.0 (18.0)[1]
32.0 (32.0)[2]
? (Yes)-webkit
未实现 12.10 未实现

[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 (Firefox 48.0 / Thunderbird 48.0 / SeaMonkey 2.45) 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 (Firefox 49.0 / Thunderbird 49.0 / SeaMonkey 2.46) 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.



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