71 lines
3.0 KiB
Markdown
71 lines
3.0 KiB
Markdown
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---
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id: 587d7dbf367417b2b2512bba
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title: Use @each to Map Over Items in a List
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required:
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- src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
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raw: true
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用@each映射列表中的项目
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---
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## Description
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<section id="description">最后一个挑战显示了<code>@for</code>指令如何使用起始值和结束值循环一定次数。 Sass还提供了<code>@each</code>指令，它循环遍历列表或映射中的每个项目。在每次迭代时，变量将从列表或映射分配给当前值。 <blockquote> @each $颜色为蓝色，红色，绿色{ <br> 。＃{$ color} -text {color：$ color;} <br> } </blockquote>地图的语法略有不同。这是一个例子： <blockquote> $ colors：（color1：blue，color2：red，color3：green）; <br><br> @each $ key，$ colors in colors { <br> 。＃{$ color} -text {color：$ color;} <br> } </blockquote>请注意，需要<code>$key</code>变量来引用地图中的键。否则，编译后的CSS将有<code>color1</code> ， <code>color2</code> ...在里面。以上两个代码示例都转换为以下CSS： <blockquote> .blue-text { <br>颜色：蓝色; <br> } <br><br> .red-text { <br>红色; <br> } <br><br> .green-text { <br>颜色：绿色; <br> } </blockquote></section>
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## Instructions
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<section id="instructions">编写一个<code>@each</code>列表的<code>@each</code>指令： <code>blue, black, red</code> ，并将每个变量分配给<code>.color-bg</code>类，其中“颜色”部分为每个项目更改。每个类应该将<code>background-color</code>设置为相应的颜色。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 您的代码应该使用<code>@each</code>指令。
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testString: 'assert(code.match(/@each /g), "Your code should use the <code>@each</code> directive.");'
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- text: 您的<code>.blue-bg</code>类应该具有蓝色的<code>background-color</code> 。
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testString: 'assert($(".blue-bg").css("background-color") == "rgb(0, 0, 255)", "Your <code>.blue-bg</code> class should have a <code>background-color</code> of blue.");'
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- text: 你的<code>.black-bg</code>类的<code>background-color</code>为黑色。
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testString: 'assert($(".black-bg").css("background-color") == "rgb(0, 0, 0)", "Your <code>.black-bg</code> class should have a <code>background-color</code> of black.");'
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- text: 您的<code>.red-bg</code>类应该具有红色的<code>background-color</code> 。
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testString: 'assert($(".red-bg").css("background-color") == "rgb(255, 0, 0)", "Your <code>.red-bg</code> class should have a <code>background-color</code> of red.");'
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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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div {
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height: 200px;
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width: 200px;
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}
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</style>
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<div class="blue-bg"></div>
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<div class="black-bg"></div>
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<div class="red-bg"></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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