ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
117 lines
2.5 KiB
Markdown
117 lines
2.5 KiB
Markdown
---
|
||
id: 587d7fa5367417b2b2512bbd
|
||
title: 将一组CSS样式扩展到另一个元素
|
||
challengeType: 0
|
||
forumTopicId: 301456
|
||
dashedName: extend-one-set-of-css-styles-to-another-element
|
||
---
|
||
|
||
# --description--
|
||
|
||
Sass 有一个名为`extend`的功能，可以很容易地从一个元素中借用 CSS 规则并在另一个元素上重用它们。
|
||
|
||
例如，下面的 CSS 规则块设置了`.panel`class 的样式。它有`background-color`，`height`和`border`。
|
||
|
||
```scss
|
||
.panel{
|
||
background-color: red;
|
||
height: 70px;
|
||
border: 2px solid green;
|
||
}
|
||
```
|
||
|
||
现在你需要另一个名为`.big-panel`的面板。它具有与`.panel`相同的基本属性，但还需要`width`和`font-size`。 可以从`.panel`复制并粘贴初始 CSS 规则，但是当你添加更多类型的面板时，代码会变得重复。 `extend`指令是一种重用为一个元素编写的规则的简单方法，然后为另一个元素添加更多：
|
||
|
||
```scss
|
||
.big-panel{
|
||
@extend .panel;
|
||
width: 150px;
|
||
font-size: 2em;
|
||
}
|
||
```
|
||
|
||
除了新样式之外，`.big-panel`将具有与`.panel`相同的属性。
|
||
|
||
# --instructions--
|
||
|
||
创建一个扩展`.info`的 class`.info-important`，并将`background-color`设置为洋红色。
|
||
|
||
# --hints--
|
||
|
||
`info-important`class 应该将`background-color`设置为`magenta`。
|
||
|
||
```js
|
||
assert(
|
||
code.match(
|
||
/\.info-important\s*?{[\s\S]*background-color\s*?:\s*?magenta\s*?;[\s\S]*}/gi
|
||
)
|
||
);
|
||
```
|
||
|
||
`info-important`class 应使用`@extend`继承`info`class 的样式。
|
||
|
||
```js
|
||
assert(
|
||
code.match(/\.info-important\s*?{[\s\S]*@extend\s*?.info\s*?;[\s\S]*/gi)
|
||
);
|
||
```
|
||
|
||
# --seed--
|
||
|
||
## --seed-contents--
|
||
|
||
```html
|
||
<style type='text/scss'>
|
||
h3{
|
||
text-align: center;
|
||
}
|
||
.info{
|
||
width: 200px;
|
||
border: 1px solid black;
|
||
margin: 0 auto;
|
||
}
|
||
|
||
|
||
|
||
|
||
</style>
|
||
<h3>Posts</h3>
|
||
<div class="info-important">
|
||
<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
|
||
</div>
|
||
|
||
<div class="info">
|
||
<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
|
||
</div>
|
||
```
|
||
|
||
# --solutions--
|
||
|
||
```html
|
||
<style type='text/scss'>
|
||
h3{
|
||
text-align: center;
|
||
}
|
||
.info{
|
||
width: 200px;
|
||
border: 1px solid black;
|
||
margin: 0 auto;
|
||
}
|
||
.info-important{
|
||
@extend .info;
|
||
background-color: magenta;
|
||
}
|
||
|
||
|
||
|
||
</style>
|
||
<h3>Posts</h3>
|
||
<div class="info-important">
|
||
<p>This is an important post. It should extend the class ".info" and have its own CSS styles.</p>
|
||
</div>
|
||
|
||
<div class="info">
|
||
<p>This is a simple post. It has basic styling and can be extended for other uses.</p>
|
||
</div>
|
||
```
|