0432ec995f
* chore(i8n,learn): processed translations * fix: remove extra space Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> Co-authored-by: Crowdin Bot <support+bot@crowdin.com> Co-authored-by: Randell Dawson <5313213+RandellDawson@users.noreply.github.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
117 lines
2.6 KiB
Markdown
117 lines
2.6 KiB
Markdown
---
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id: 587d7fa5367417b2b2512bbd
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title: 将一组 CSS 样式扩展到另一个元素
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challengeType: 0
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forumTopicId: 301456
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dashedName: extend-one-set-of-css-styles-to-another-element
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---
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# --description--
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Sass 有一个名为 `extend` 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 `.panel` class 的样式。 它有 `background-color`，`height` 和 `border`。
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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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现在需要另一个名为 `.big-panel` 的面板。 它具有与 `.panel` 相同的基本属性，但还需要 `width` 和 `font-size`。 可以从 `.panel` 复制并粘贴初始 CSS 规则，但是当添加更多类型的面板时，代码会变得重复。 `extend` 指令是一种重用为一个元素编写的规则的简单方法，可以为另一个元素重用并添加更多规则：
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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，`.big-panel` 将具有与 `.panel` 相同的属性。
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# --instructions--
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创建一个扩展 `.info` 的 class `.info-important`，并将`background-color` 设置为洋红色（magenta）。
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# --hints--
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`info-important` class 应该将 `background-color` 设置为 `magenta`。
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```js
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assert(
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code.match(
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/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi
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)
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);
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```
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`info-important` class 应使用 `@extend` 继承 `info` class 的样式。
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```js
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assert(
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code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi)
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);
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```
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# --seed--
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## --seed-contents--
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```html
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<style type='text/scss'>
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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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# --solutions--
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```html
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<style type='text/scss'>
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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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