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freeCodeCamp/curriculum/challenges/chinese/03-front-end-libraries/sass/extend-one-set-of-css-styles-to-another-element.chinese.md

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---
id: 587d7fa5367417b2b2512bbd
title: Extend One Set of CSS Styles to Another Element
challengeType: 0
forumTopicId: 301456
localeTitle: 将一组CSS样式扩展到另一个元素
---
## Description
<section id='description'>
Sass 有一个名为<code>extend</code>的功能,可以很容易地从一个元素中借用 CSS 规则并在另一个元素上重用它们。
例如,下面的 CSS 规则块设置了<code>.panel</code>class 的样式。它有<code>background-color</code><code>height</code><code>border</code>
```scss
.panel{
background-color: red;
height: 70px;
border: 2px solid green;
}
```
现在你需要另一个名为<code>.big-panel</code>的面板。它具有与<code>.panel</code>相同的基本属性,但还需要<code>width</code><code>font-size</code>
可以从<code>.panel</code>复制并粘贴初始 CSS 规则,但是当你添加更多类型的面板时,代码会变得重复。
<code>extend</code>指令是一种重用为一个元素编写的规则的简单方法,然后为另一个元素添加更多:
```scss
.big-panel{
@extend .panel;
width: 150px;
font-size: 2em;
}
```
除了新样式之外,<code>.big-panel</code>将具有与<code>.panel</code>相同的属性。
</section>
## Instructions
<section id='instructions'>
创建一个扩展<code>.info</code>的 class<code>.info-important</code>,并将<code>background-color</code>设置为洋红色。
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>info-important</code>class 应该将<code>background-color</code>设置为<code>magenta</code>
testString: assert(code.match(/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi));
- text: <code>info-important</code>class 应使用<code>@extend</code>继承<code>info</code>class 的样式。
testString: assert(code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi));
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='html-seed'>
```html
<style type='text/sass'>
h3{
text-align: center;
}
.info{
width: 200px;
border: 1px solid black;
margin: 0 auto;
}
</style>
<h3>Posts</h3>
<div class="info-important">
<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
</div>
<div class="info">
<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
</div>
```
</div>
</section>
## Solution
<section id='solution'>
```html
<style type='text/sass'>
h3{
text-align: center;
}
.info{
width: 200px;
border: 1px solid black;
margin: 0 auto;
}
.info-important{
@extend .info;
background-color: magenta;
}
</style>
<h3>Posts</h3>
<div class="info-important">
<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
</div>
<div class="info">
<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
</div>
```
</section>