117 lines
2.6 KiB
Markdown
117 lines
2.6 KiB
Markdown
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---
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id: 587d7fa5367417b2b2512bbd
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title: 將一組 CSS 樣式擴展到另一個元素
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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 有一個名爲 `extend` 的功能，可以很容易地從一個元素中借用 CSS 規則並在另一個元素上重用它們。
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例如，下面的 CSS 規則塊設置了 `.panel` class 的樣式。 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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現在需要另一個名爲 `.big-panel` 的面板。 它具有與 `.panel` 相同的基本屬性，但還需要 `width` 和 `font-size`。 可以從 `.panel` 複製並粘貼初始 CSS 規則，但是當添加更多類型的面板時，代碼會變得重複。 `extend` 指令是一種重用爲一個元素編寫的規則的簡單方法，可以爲另一個元素重用並添加更多規則：
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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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除了新樣式之外，`.big-panel` 將具有與 `.panel` 相同的屬性。
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# --instructions--
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創建一個擴展 `.info` 的 class `.info-important`，並將`background-color` 設置爲洋紅色（magenta）。
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# --hints--
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`info-important` class 應該將 `background-color` 設置爲 `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 應使用 `@extend` 繼承 `info` class 的樣式。
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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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