70 lines
3.7 KiB
Markdown
70 lines
3.7 KiB
Markdown
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---
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id: 587d7dbe367417b2b2512bb8
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title: Use @if and @else to Add Logic To Your Styles
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用@if和@else将逻辑添加到您的样式
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---
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## Description
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<section id="description"> Sass中的<code>@if</code>指令对于测试特定情况很有用 - 它就像JavaScript中的<code>if</code>语句一样。 <blockquote> @mixin make-bold（$ bool）{ <br> @if $ bool == true { <br> font-weight：bold; <br> } <br> } </blockquote>就像在JavaScript中一样， <code>@else if</code>和<code>@else</code>测试更多条件： <blockquote> @mixin text-effect（$ val）{ <br> @if $ val == danger { <br>红色; <br> } <br> @else if $ val == alert { <br>颜色：黄色; <br> } <br> @else if $ val == success { <br>颜色：绿色; <br> } <br> @else { <br>颜色：黑色; <br> } <br> } </blockquote></section>
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## Instructions
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<section id="instructions">创建一个名为<code>border-stroke</code>的<code>mixin</code> ，它接受一个参数<code>$val</code> 。 <code>mixin</code>应使用<code>@if</code> ， <code>@else if</code>和<code>@else</code>检查以下条件： <blockquote>光 - 1px纯黑色<br>中等 - 3px纯黑色<br>重 - 6px纯黑色<br>没有 - 没有边界</blockquote></section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 你的代码应该声明一个名为<code>border-stroke</code>的<code>mixin</code> ，它有一个名为<code>$val</code>的参数。
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testString: 'assert(code.match(/@mixin\s+?border-stroke\s*?\(\s*?\$val\s*?\)\s*?{/gi), "Your code should declare a <code>mixin</code> named <code>border-stroke</code> which has a parameter named <code>$val</code>.");'
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- text: 你的<code>mixin</code>应该有一个<code>@if</code>语句来检查<code>$val</code>是否很亮，并将<code>border</code>设置为1px纯黑色。
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testString: 'assert(code.match(/@if\s+?\$val\s*?===?\s*?light\s*?{\s*?border\s*?:\s*?1px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.");'
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- text: 你的<code>mixin</code>应该有一个<code>@else if</code>语句来检查<code>$val</code>是否为中等，并将<code>border</code>设置为3px纯黑色。
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testString: 'assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?medium\s*?{\s*?border\s*?:\s*?3px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.");'
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- text: 你的<code>mixin</code>应该有一个<code>@else if</code>语句来检查<code>$val</code>是否很重，并将<code>border</code>设置为6px纯黑色。
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testString: 'assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?heavy\s*?{\s*?border\s*?:\s*?6px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.");'
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- text: 你的<code>mixin</code>应该有一个<code>@else</code>语句来设置<code>border</code>为none。
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testString: 'assert(code.match(/@else\s*?{\s*?border\s*?:\s*?none\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else</code> statement to set the <code>border</code> to none.");'
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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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#box {
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width: 150px;
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height: 150px;
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background-color: red;
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@include border-stroke(medium);
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}
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</style>
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<div id="box"></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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```js
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// solution required
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```
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</section>
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