121 lines
2.8 KiB
Markdown
121 lines
2.8 KiB
Markdown
---
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id: 587d7dbd367417b2b2512bb4
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title: Store Data with Sass Variables
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challengeType: 0
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forumTopicId: 301460
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localeTitle: 用 Sass 变量存储数据
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---
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## Description
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<section id='description'>
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Sass 不同于 CSS 的一个特点是它允许使用变量。我们可以在 Sass 中声明变量，并为它赋值，就像我们在 JavaScript 中一样。
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在 JavaScript 中，变量是使用<code>let</code>和<code>const</code>关键字定义的。在 Sass 中，变量以<code>$</code>开头的，后跟变量名。
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这里有几个例子：
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```scss
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$main-fonts: Arial, sans-serif;
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$headings-color: green;
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//To use variables:
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h1 {
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font-family: $main-fonts;
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color: $headings-color;
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}
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```
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当需要把多个元素设置成相同颜色时，变量就会很有用。一旦我们需要更改颜色，只需要改变这个变量的值就好。
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</section>
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## Instructions
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<section id='instructions'>
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创建一个变量<code>$text-color</code>并将其设置为红色。然后更改<code>.blog-post</code>和<code>h2</code>的<code>color</code>属性的值为<code>$text-color</code>变量。
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 你应该为<code>$text-color</code>声明一个值为红色的 Sass 变量。
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testString: assert(code.match(/\$text-color:\s*?red;/g));
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- text: 你应使用<code>$text-color</code>变量来更改<code>.blog-post</code>和<code>h2</code>的<code>颜色</code>。
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testString: assert(code.match(/color:\s*?\$text-color;/g));
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- text: <code>.blog-post</code>元素应为红色。
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testString: assert($('.blog-post').css('color') == 'rgb(255, 0, 0)');
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- text: <code>h2</code>元素应为红色。
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testString: assert($('h2').css('color') == 'rgb(255, 0, 0)');
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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 type='text/sass'>
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.header{
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text-align: center;
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}
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.blog-post, h2 {
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color: red;
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}
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</style>
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<h1 class="header">Learn Sass</h1>
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<div class="blog-post">
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<h2>Some random title</h2>
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<p>This is a paragraph with some random text in it</p>
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</div>
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<div class="blog-post">
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<h2>Header #2</h2>
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<p>Here is some more random text.</p>
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</div>
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<div class="blog-post">
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<h2>Here is another header</h2>
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<p>Even more random text within a paragraph</p>
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</div>
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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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<style type='text/sass'>
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$text-color: red;
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.header{
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text-align: center;
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}
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.blog-post, h2 {
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color: $text-color;
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}
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</style>
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<h1 class="header">Learn Sass</h1>
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<div class="blog-post">
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<h2>Some random title</h2>
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<p>This is a paragraph with some random text in it</p>
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</div>
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<div class="blog-post">
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<h2>Header #2</h2>
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<p>Here is some more random text.</p>
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</div>
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<div class="blog-post">
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<h2>Here is another header</h2>
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<p>Even more random text within a paragraph</p>
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</div>
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```
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</section>
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