92 lines
3.3 KiB
Markdown
92 lines
3.3 KiB
Markdown
---
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id: bad87fee1348bd9aecf08806
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title: Use a CSS Class to Style an Element
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用CSS类来设置元素的样式
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---
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## Description
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<section id="description">类是可重用的样式，可以添加到HTML元素中。这是一个CSS类声明示例： <blockquote> <风格> <br> .blue-text { <br>颜色：蓝色; <br> } <br> </样式> </blockquote>您可以看到我们在<code><style></code>标记内创建了一个名为<code>blue-text</code>的CSS类。您可以将类应用于HTML元素，如下所示： <code><h2 class="blue-text">CatPhotoApp</h2></code>请注意，在CSS <code>style</code>元素中，类名以句点开头。在HTML元素的class属性中，类名不包含句点。 </section>
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## Instructions
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<section id="instructions">在<code>style</code>元素中，将<code>h2</code>选择器更改为<code>.red-text</code>并将颜色的值从<code>blue</code>更新为<code>red</code> 。为您的<code>h2</code>元素提供值为<code>'red-text'</code>的<code>class</code>属性。 </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: 你的<code>h2</code>元素应该是红色的。
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testString: 'assert($("h2").css("color") === "rgb(255, 0, 0)", "Your <code>h2</code> element should be red.");'
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- text: 你的<code>h2</code>元素应该有<code>red-text</code>类。
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testString: 'assert($("h2").hasClass("red-text"), "Your <code>h2</code> element should have the class <code>red-text</code>.");'
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- text: 样式表应声明一个<code>red-text</code>类，并将其颜色设置为红色。
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testString: 'assert(code.match(/\.red-text\s*\{\s*color\s*:\s*red;\s*\}/g), "Your stylesheet should declare a <code>red-text</code> class and have its color set to red.");'
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- text: '不要在<code>h2</code>元素中使用<code>style="color: red"</code>内联样式声明。'
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testString: 'assert($("h2").attr("style") === undefined, "Do not use inline style declarations like <code>style="color: red"</code> in your <code>h2</code> element.");'
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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>
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h2 {
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color: blue;
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}
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</style>
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<h2>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="/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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</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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