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								---
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								id: bad87fee1348bd9aedf08805
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											2020-12-16 00:37:30 -07:00
										 
									 
								 
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								title: 使用元素选择器来设置元素的样式
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								challengeType: 0
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											2019-12-13 13:47:57 +08:00
										 
									 
								 
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								videoUrl: 'https://scrimba.com/c/cJKMBT2'
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								forumTopicId: 18349
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											2021-01-13 03:31:00 +01:00
										 
									 
								 
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								dashedName: use-css-selectors-to-style-elements
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								---
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								# --description--
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											2021-02-06 04:42:36 +00:00
										 
									 
								 
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								在 CSS 中,页面样式的属性有几百个,你可以用来改变元素在页面上的外观。
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								当你输入 `<h2 style="color: red;">CatPhotoApp</h2>`,就可以用行内 CSS 设置 `h2` 元素的样式。
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								这是指定元素样式的一种方法,但有一个更好的方法来应用 CSS。
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											2021-01-08 11:20:48 -08:00
										 
									 
								 
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								在代码的顶部,创建一个 `style` 声明区域,如下方所示:
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								```html
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								<style>
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								</style>
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								```
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								在样式声明区域内,可以为所有 `h2` 元素创建一个 <dfn>CSS selector</dfn>。 如果想让所有 `h2` 元素在变成红色,可以添加下方的样式规则:
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								```html
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								<style>
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								  h2 {
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								    color: red;
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								  }
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								</style>
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								```
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								请注意,每个元素的样式规则都应该有开始和结束大括号(`{` 和 `}`)。 还需要确保元素的样式定义在开始和结束样式标签之间。 你需要确保所有样式规则位于花括号之间,并且每条样式规则都以分号结束。
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								# --instructions--
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								请删除 `h2` 元素的行内样式,然后创建 `style` 样式声明区域, 最后添加 CSS 样式规则使所有 `h2` 元素变为蓝色。
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								# --hints--
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								应删除 `h2` 元素的 `style` 样式。
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								```js
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								assert(!$('h2').attr('style'));
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								```
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								应创建一个 `style` 样式声明区域。
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								```js
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								assert($('style') && $('style').length >= 1);
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								```
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								`h2` 元素颜色应为蓝色。
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								```js
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								assert($('h2').css('color') === 'rgb(0, 0, 255)');
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								```
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								确保 `h2` 选择器的内容被花括号所包围,样式规则应以分号结束。
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								```js
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								assert(code.match(/h2\s*\{\s*color\s*:.*;\s*\}/g));
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								```
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											2020-02-18 01:40:55 +09:00
										 
									 
								 
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								`style` 标签应符合语法,且应有一个结束标签。
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								```js
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								assert(
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								  code.match(/<\/style>/g) &&
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								    code.match(/<\/style>/g).length ===
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								      (
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								        code.match(
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								          /<style((\s)*((type|media|scoped|title|disabled)="[^"]*")?(\s)*)*>/g
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								        ) || []
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								      ).length
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								);
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								```
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								# --seed--
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								## --seed-contents--
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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="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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								  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="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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