134 lines
3.2 KiB
Markdown
134 lines
3.2 KiB
Markdown
---
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id: bad87fee1348bd9aefe08806
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title: 使用 class 选择器设置多个元素的样式
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cRkVbsQ'
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forumTopicId: 18311
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dashedName: style-multiple-elements-with-a-css-class
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---
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# --description--
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通过 CSS class 选择器，多个 HTML 元素可以使用相同的 CSS 样式规则。 你可以将 `red-text` class 添加到第一个 `p` 元素上。
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# --hints--
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`h2` 元素应该是红色的。
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```js
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assert($('h2').css('color') === 'rgb(255, 0, 0)');
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```
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`h2` 元素应含有 `red-text` class。
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```js
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assert($('h2').hasClass('red-text'));
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```
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第一个 `p` 元素应为红色。
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```js
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assert($('p:eq(0)').css('color') === 'rgb(255, 0, 0)');
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```
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第二和第三个 `p` 元素不应为红色。
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```js
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assert(
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!($('p:eq(1)').css('color') === 'rgb(255, 0, 0)') &&
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!($('p:eq(2)').css('color') === 'rgb(255, 0, 0)')
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);
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```
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第一个 `p` 元素应该包含 `red-text` class。
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```js
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assert($('p:eq(0)').hasClass('red-text'));
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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>
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.red-text {
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color: red;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p>Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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# --solutions--
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```html
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<style>
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.red-text {
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color: red;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div>
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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