73 lines
2.8 KiB
Markdown
73 lines
2.8 KiB
Markdown
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---
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id: 587d7fa5367417b2b2512bbd
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title: Extend One Set of CSS Styles to Another Element
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challengeType: 0
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videoUrl: ''
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localeTitle: 将一组CSS样式扩展到另一个元素
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---
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## Description
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<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构建它们。例如，下面的CSS规则块会设置一个<code>.panel</code>类。它有<code>background-color</code> ， <code>height</code>和<code>border</code> 。 <blockquote> 。面板{ <br>背景颜色：红色; <br>身高：70px; <br>边框：2px纯绿色; <br> } </blockquote>现在你想要另一个名为<code>.big-panel</code> 。它具有与<code>.panel</code>相同的基本属性，但也需要<code>width</code>和<code>font-size</code> 。可以从<code>.panel</code>复制并粘贴初始CSS规则，但是当您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： <blockquote> 。大面板{ <br> @extend .panel; <br>宽度：150px; <br> font-size：2em; <br> } </blockquote>除了新样式之外， <code>.big-panel</code>还具有与<code>.panel</code>相同的属性。 </section>
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## Instructions
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<section id="instructions">创建一个扩展<code>.info</code>的类<code>.info-important</code> ，并将<code>background-color</code>设置为洋红色。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 您的<code>info-important</code>类应该将<code>background-color</code>设置为<code>magenta</code> 。
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testString: 'assert(code.match(/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi), "Your <code>info-important</code> class should have a <code>background-color</code> set to <code>magenta</code>.");'
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- text: 您的<code>info-important</code>类应使用<code>@extend</code>从<code>info</code>类继承样式。
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testString: 'assert(code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi), "Your <code>info-important</code> class should use <code>@extend</code> to inherit the styling from the <code>info</code> class.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style type='text/sass'>
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h3{
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text-align: center;
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}
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.info{
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width: 200px;
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border: 1px solid black;
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margin: 0 auto;
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}
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</style>
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<h3>Posts</h3>
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<div class="info-important">
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<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
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</div>
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<div class="info">
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<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
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</div>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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