88 lines
3.9 KiB
Markdown
88 lines
3.9 KiB
Markdown
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---
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id: bad87fee1348bd9aedf08805
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title: Use CSS Selectors to Style Elements
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用CSS选择器设置样式元素
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---
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## Description
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<section id="description">使用CSS，您可以使用数百种CSS <code>properties</code>来更改元素在页面上的显示方式。当您输入<code><h2 style="color: red">CatPhotoApp</h2></code> ，您使用<code>inline CSS</code> （代表<code>Cascading Style Sheets</code>对单个<code>h2</code>元素进行<code>Cascading Style Sheets</code> 。这是指定元素样式的一种方法，但有一种更好的方法来应用<code>CSS</code> 。在代码的顶部，创建一个<code>style</code>块，如下所示： <blockquote> <风格> <br> </样式> </blockquote>在该样式块中，您可以为所有<code>h2</code>元素创建<code>CSS selector</code> 。例如，如果您希望所有<code>h2</code>元素都是红色，则可以添加如下所示的样式规则： <blockquote> <风格> <br> h2 {color：red;} <br> </样式> </blockquote>请注意，在每个元素的样式规则周围同时打开和关闭花括号（ <code>{</code>和<code>}</code> ）非常重要。您还需要确保元素的样式定义位于开始和结束样式标记之间。最后，请务必在每个元素的样式规则的末尾添加分号。 </section>
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## Instructions
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<section id="instructions">删除<code>h2</code>元素的样式属性，而不是创建CSS <code>style</code>块。添加必要的CSS以将所有<code>h2</code>元素变为蓝色。 </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: 从<code>h2</code>元素中删除style属性。
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testString: 'assert(!$("h2").attr("style"), "Remove the style attribute from your <code>h2</code> element.");'
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- text: 创建<code>style</code>元素。
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testString: 'assert($("style") && $("style").length > 1, "Create a <code>style</code> element.");'
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- text: 你的<code>h2</code>元素应该是蓝色的。
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testString: 'assert($("h2").css("color") === "rgb(0, 0, 255)", "Your <code>h2</code> element should be blue.");'
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- text: 确保样式表<code>h2</code>声明对分号和右括号有效。
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testString: 'assert(code.match(/h2\s*\{\s*color\s*:.*;\s*\}/g), "Ensure that your stylesheet <code>h2</code> declaration is valid with a semicolon and closing brace.");'
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- text: 确保所有<code>style</code>元素都有效并具有结束标记。
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testString: 'assert(code.match(/<\/style>/g) && code.match(/<\/style>/g).length === (code.match(/<style((\s)*((type|media|scoped|title|disabled)="[^"]*")?(\s)*)*>/g) || []).length, "Make sure all your <code>style</code> elements are valid and have a closing tag.");'
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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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<h2 style="color: red">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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