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freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/css-flexbox/use-the-flex-shorthand-property.md

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---
id: 587d78ae367417b2b2512afe
challengeType: 0
videoUrl: 'https://scrimba.com/p/pVaDAv/cbpW2tE'
forumTopicId: 301112
2020-10-01 17:54:21 +02:00
title: 使用 flex 短方法属性
---
## Description
<section id='description'>
上面几个 flex 属性有一个简写方式。<code>flex-grow</code><code>flex-shrink</code><code>flex-basis</code>属性可以在<code>flex</code>中一同设置。
例如,<code>flex: 1 0 10px;</code>会把项目属性设为<code>flex-grow: 1;</code><code>flex-shrink: 0;</code>以及<code>flex-basis: 10px;</code>
属性的默认设置是<code>flex: 0 1 auto;</code>
</section>
## Instructions
<section id='instructions'>
<code>#box-1</code><code>#box-2</code>添加<code>flex</code>属性。为<code>#box-1</code>设置<code>flex-grow</code>属性值为 <code>2</code><code>flex-shrink</code>属性值为 <code>2</code><code>flex-basis</code>属性值为 <code>150px</code>。为<code>#box-2</code>设置<code>flex-grow</code>属性值为 <code>1</code><code>flex-shrink</code>属性值为 <code>1</code><code>flex-basis</code>属性值为 <code>150px</code>
通过上面的设置,在容器大于 300px 时,<code>#box-1</code>扩大的空间是<code>#box-2</code>扩大空间的两倍;在容器小于 300px 时,<code>#box-1</code>缩小的空间<code>#box-2</code>缩小空间的两倍。300px 是两个盒子的<code>flex-basis</code>的值之和。
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>#box-1</code>元素应有<code>flex</code>属性,其值应为 <code>2 2 150px</code>
testString: assert($('#box-1').css('flex-grow') == '2' && $('#box-1').css('flex-shrink') == '2' && $('#box-1').css('flex-basis') == '150px');
- text: <code>#box-2</code>元素应有<code>flex</code>属性,其值应为 <code>1 1 150px</code>
testString: assert($('#box-2').css('flex-grow') == '1' && $('#box-2').css('flex-shrink') == '1' && $('#box-2').css('flex-basis') == '150px');
- text: <code>#box-1</code><code>#box-2</code>应具有<code>flex</code>属性。
testString: assert(code.match(/flex:\s*?\d\s+?\d\s+?150px;/g).length == 2);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='html-seed'>
```html
<style>
#box-container {
display: flex;
height: 500px;
}
#box-1 {
background-color: dodgerblue;
height: 200px;
}
#box-2 {
background-color: orangered;
height: 200px;
}
</style>
<div id="box-container">
<div id="box-1"></div>
<div id="box-2"></div>
</div>
```
</div>
</section>
## Solution
<section id='solution'>
```html
// solution required
```
</section>