117 lines
4.1 KiB
Markdown
117 lines
4.1 KiB
Markdown
---
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id: bad87dee1348bd9aede07836
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title: Use an id Attribute to Style an Element
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用id属性为元素设置样式
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---
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## Description
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<section id="description">关于<code>id</code>属性的一个很酷的事情是，像类一样，你可以使用CSS来设置它们的样式。但是， <code>id</code>不可重用，只应应用于一个元素。 <code>id</code>也具有比类更高的特异性（重要性），因此如果两者都应用于同一元素并且具有冲突的样式，则将应用<code>id</code>的样式。下面是一个示例，说明如何使用<code>cat-photo-element</code>的<code>id</code>属性获取<code>cat-photo-element</code>并为其指定绿色的背景颜色。在你的<code>style</code>元素中： <blockquote> #cat-photo-element { <br>背景颜色：绿色; <br> } </blockquote>请注意，在<code>style</code>元素中，您始终通过放置a来引用类<code>.</code>在他们的名字前面。你总是通过在他们的名字前放一个<code>#</code>来引用id。 </section>
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## Instructions
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<section id="instructions">尝试提供您的表单，该表单现在具有<code>cat-photo-form</code>的<code>id</code>属性，绿色背景。 </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: 为<code>form</code>元素添加<code>cat-photo-form</code>的id。
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testString: 'assert($("form").attr("id") === "cat-photo-form", "Give your <code>form</code> element the id of <code>cat-photo-form</code>.");'
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- text: 您的<code>form</code>元素应具有绿色的<code>background-color</code> 。
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testString: 'assert($("#cat-photo-form").css("background-color") === "rgb(0, 128, 0)", "Your <code>form</code> element should have the <code>background-color</code> of green.");'
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- text: 确保您的<code>form</code>元素具有<code>id</code>属性。
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testString: 'assert(code.match(/<form.*cat-photo-form.*>/gi) && code.match(/<form.*cat-photo-form.*>/gi).length > 0, "Make sure your <code>form</code> element has an <code>id</code> attribute.");'
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- text: 不要为<code>form</code>任何<code>class</code>或<code>style</code>属性。
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testString: 'assert(!code.match(/<form.*style.*>/gi) && !code.match(/<form.*class.*>/gi), "Do not give your <code>form</code> any <code>class</code> or <code>style</code> attributes.");'
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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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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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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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h2 {
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font-family: Lobster, monospace;
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}
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p {
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font-size: 16px;
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font-family: monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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.smaller-image {
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width: 100px;
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}
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.silver-background {
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background-color: silver;
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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 class="smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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<div class="silver-background">
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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" id="cat-photo-form">
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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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