2018-10-10 22:03:03 +00:00
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---
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id: 587d7dbd367417b2b2512bb5
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2020-12-16 07:37:30 +00:00
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title: 用 Sass 嵌套 CSS
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2018-10-10 22:03:03 +00:00
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challengeType: 0
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2020-09-07 08:11:08 +00:00
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forumTopicId: 301457
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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Sass 允许 CSS 规则的`嵌套`,这在写样式表的时候会很有用。
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2020-09-07 08:11:08 +00:00
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在 CSS 里,每个元素的样式都需要写在独立的代码块中,如下所示:
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```scss
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nav {
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background-color: red;
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}
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nav ul {
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list-style: none;
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}
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nav ul li {
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display: inline-block;
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}
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```
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2020-12-16 07:37:30 +00:00
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对于一个大型项目,CSS 规则会很复杂。这时,引入`嵌套`功能(即在对应的父元素中写子元素的样式)可以有效地简化代码:
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2020-09-07 08:11:08 +00:00
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```scss
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nav {
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background-color: red;
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ul {
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list-style: none;
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li {
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display: inline-block;
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}
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}
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}
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```
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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根据上面关于嵌套的例子,来简化<code>.blog-post<code>中两个子元素的 CSS 代码。出于测试目的,<code>h1</code>应该出现在<code>p</code>元素之前。</code></code>
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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你应重新组织 CSS 规则,以便`h1`和`p`嵌套在`.blog-post`父元素中。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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code.match(
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/\.blog-post\s*?{\s*?h1\s*?{\s*?text-align:\s*?center;\s*?color:\s*?blue;\s*?}\s*?p\s*?{\s*?font-size:\s*?20px;\s*?}\s*?}/gi
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)
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2020-08-13 15:24:35 +00:00
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