125 lines
3.0 KiB
Markdown
125 lines
3.0 KiB
Markdown
---
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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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forumTopicId: 301456
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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'>
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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。
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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>和<code>border</code>。
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```scss
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.panel{
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background-color: red;
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height: 70px;
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border: 2px solid green;
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}
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```
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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>和<code>font-size</code>。
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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。
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<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：
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```scss
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.big-panel{
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@extend .panel;
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width: 150px;
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font-size: 2em;
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}
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```
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除了新样式之外，<code>.big-panel</code>将具有与<code>.panel</code>相同的属性。
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</section>
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## Instructions
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<section id='instructions'>
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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。
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</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: <code>info-important</code>class 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));
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- text: <code>info-important</code>class 应使用<code>@extend</code>继承<code>info</code>class 的样式。
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testString: assert(code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi));
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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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```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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.info-important{
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@extend .info;
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background-color: magenta;
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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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</section>
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