120 lines
2.9 KiB
Markdown
120 lines
2.9 KiB
Markdown
---
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id: bad87eee1348bd9aede07836
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title: Set the id of an Element
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cN6MEc2'
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forumTopicId: 18279
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localeTitle: 设置元素的 id
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---
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## Description
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<section id='description'>
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除了class属性，每一个 HTML 元素也都有<code>id</code>属性。
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使用<code>id</code>有几个好处：你可以通过<code>id</code>选择器来改变单个元素的样式，稍后的课程中，你也会了解到在 JavaScript 里面，可以通过<code>id</code>来选择元素和操作元素。
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<code>id</code>属性应是唯一的。浏览器不强迫执行这规范，但是这是广泛认可的最佳实践。所以，请不要给多个元素设置相同的<code>id</code>属性。
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设置<code>h2</code>元素的 id 为<code>cat-photo-app</code>的方法如下：
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<code><h2 id="cat-photo-app"></code>
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</section>
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## Instructions
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<section id='instructions'>
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设置<code>form</code>元素的 id 为<code>cat-photo-form</code>。
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</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: '<code>form</code>元素的 id 应为<code>cat-photo-form</code>。'
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testString: assert($("form").attr("id") === "cat-photo-form");
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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">点击查看更多<a href="#">猫图</a>.</p>
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<a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="一只仰卧着的萌猫" class="smaller-image thick-green-border"></a>
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<div class="silver-background">
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<p>猫咪最喜欢的三件东西：</p>
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<ul>
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<li>猫薄荷</li>
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<li>激光笔</li>
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<li>千层饼</li>
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</ul>
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<p>猫咪最讨厌的三件东西：</p>
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<ol>
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<li>跳蚤</li>
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<li>打雷</li>
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<li>同类</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">室内</label>
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<label><input type="radio" name="indoor-outdoor">室外</label><br>
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<label><input type="checkbox" name="personality">忠诚</label>
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<label><input type="checkbox" name="personality">懒惰</label>
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<label><input type="checkbox" name="personality">积极</label><br>
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<input type="text" placeholder="猫咪图片地址" required>
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<button type="submit">提交</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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```html
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// solution required
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```
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</section>
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