flex-grow

CSS属性 flex-grow设置了一个flex项主尺寸的flex增长系数。它指定了flex容器中剩余空间的多少应该分配给项目(flex增长系数)。

主尺寸是项的宽度或高度,这取决于flex-direction值。

剩余的空间是flex容器的大小减去所有flex项的大小加起来的大小。如果所有的兄弟项目都有相同的flex-grow系数,那么所有的项目将获得相同的剩余空间,否则将根据不同的flex-grow系数定义的比例进行分配。

flex-grow 与其他的flex属性flex-shrinkflex-basis一起使用,通常使用flex 速记来定义,以确保所有的值都被设置。

更多属性和信息请参见使用 CSS 弹性盒子

语法

CSS 属性值定义语法: <number>
/* <number> values */
flex-grow: 3;
flex-grow: 0.6;

/* 全局 values */
flex-grow: inherit;
flex-grow: initial;
flex-grow: unset;

<number>
参见 <number>。负值无效,默认为0。

正式语法

<number>

例子:

HTML

<h4>This is a Flex-Grow</h4>
<h5>A,B,C and F are flex-grow:1 . D and E are flex-grow:2 .</h5>
<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 class="box" style="background-color:brown;">F</div>
</div>

CSS

#content {
  display: flex;

  justify-content: space-around;
  flex-flow: row wrap;
  align-items: stretch;
}

.box {
  flex-grow: 1;
  border: 3px solid rgba(0,0,0,.2);
}

.box1 {
  flex-grow: 2;
  border: 3px solid rgba(0,0,0,.2);
}

结果

规范

规范 状态 备注
CSS灵活包装盒布局模块 Candidate Recommendation 初步定义

初始值0
适用元素flex items, including in-flow pseudo-elements
是否是继承属性
计算值as specified
Animation typea number

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
flex-growChrome Full support 29
Full support 29
Full support 22
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge Full support 12
Full support 12
Full support 12
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Full support 20
Notes
Full support 20
Notes
Notes Since Firefox 28, multi-line flexbox is supported.
No support 18 — 20
Disabled
Disabled From version 18 until version 20 (exclusive): this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE Full support 11
Full support 11
Full support 10
Alternate Name
Alternate Name Uses the non-standard name: -ms-flex-positive
Opera Full support 12.1
Full support 12.1
Full support 15
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Safari Full support 9
Full support 9
Full support 6.1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
WebView Android Full support 4.4
Full support 4.4
Full support ≤37
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Chrome Android Full support 29
Full support 29
Full support 25
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Firefox Android Full support 20
Notes
Full support 20
Notes
Notes Since Firefox 28, multi-line flexbox is supported.
No support 18 — 20
Disabled
Disabled From version 18 until version 20 (exclusive): this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 12.1
Full support 12.1
Full support 14
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Safari iOS Full support 9
Full support 9
Full support 7
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Samsung Internet Android Full support 2.0
Full support 2.0
Full support 1.5
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
<0 animate
Non-standard
Chrome Full support 49Edge Full support 79Firefox Full support 32
Notes
Full support 32
Notes
Notes Before Firefox 32, Firefox wasn't able to animate values starting or stopping at 0.
IE No support NoOpera Full support 36Safari No support NoWebView Android Full support 49Chrome Android Full support 49Firefox Android Full support 32
Notes
Full support 32
Notes
Notes Before Firefox 32, Firefox wasn't able to animate values starting or stopping at 0.
Opera Android Full support 36Safari iOS No support NoSamsung Internet Android Full support 5.0

Legend

Full support  
Full support
No support  
No support
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.
Uses a non-standard name.
Uses a non-standard name.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

参见