2018-10-10 18:03:03 -04:00
|
|
|
---
|
|
|
|
id: 587d7dbd367417b2b2512bb4
|
2021-03-07 09:15:14 -07:00
|
|
|
title: 用 Sass 变量存储数据
|
2018-10-10 18:03:03 -04:00
|
|
|
challengeType: 0
|
2020-09-07 16:11:08 +08:00
|
|
|
forumTopicId: 301460
|
2021-01-13 03:31:00 +01:00
|
|
|
dashedName: store-data-with-sass-variables
|
2018-10-10 18:03:03 -04:00
|
|
|
---
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
# --description--
|
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
Sass 不同于 CSS 的一个特点是它允许使用变量。 可以在 Sass 中声明变量,并为它赋值,就像在 JavaScript 中一样。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
在 JavaScript 中,变量是使用 `let` 和 `const` 关键字定义的。 在 Sass 中,变量以 `$` 开头的,后跟变量名。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
这里有几个例子:
|
2020-09-07 16:11:08 +08:00
|
|
|
|
|
|
|
```scss
|
|
|
|
$main-fonts: Arial, sans-serif;
|
|
|
|
$headings-color: green;
|
2021-03-07 09:15:14 -07:00
|
|
|
```
|
|
|
|
|
|
|
|
并使用变量:
|
2020-09-07 16:11:08 +08:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
```scss
|
2020-09-07 16:11:08 +08:00
|
|
|
h1 {
|
|
|
|
font-family: $main-fonts;
|
|
|
|
color: $headings-color;
|
|
|
|
}
|
|
|
|
```
|
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
当需要把多个元素设置成相同颜色时,变量就会很有用。 一旦需要更改颜色,只需要改变这个变量的值就好。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
# --instructions--
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
创建一个变量 `$text-color` 并将其设置为 `red`。 然后更改 `.blog-post` 和 `h2` 的 `color` 属性的值为 `$text-color` 变量。
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
# --hints--
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
应该把 `$text-color` 声明一个值为 `red` 的 Sass 变量。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
```js
|
2021-05-24 00:42:08 -07:00
|
|
|
assert(code.match(/\$text-color\s*:\s*?red\s*;/g));
|
2020-12-16 00:37:30 -07:00
|
|
|
```
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
应使用 `$text-color` 变量来更改 `.blog-post` 和 `h2` 的 `color`。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
```js
|
2021-05-24 00:42:08 -07:00
|
|
|
assert(code.match(/color\s*:\s*\$text-color\s*;?/g));
|
2020-12-16 00:37:30 -07:00
|
|
|
```
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
`.blog-post` 元素 `color` 应为红色。
|
2018-10-10 18:03:03 -04:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
```js
|
|
|
|
assert($('.blog-post').css('color') == 'rgb(255, 0, 0)');
|
|
|
|
```
|
2020-09-07 16:11:08 +08:00
|
|
|
|
2021-03-07 09:15:14 -07:00
|
|
|
`h2` 元素的 `color` 应为红色。
|
2020-09-07 16:11:08 +08:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
```js
|
|
|
|
assert($('h2').css('color') == 'rgb(255, 0, 0)');
|
2018-10-10 18:03:03 -04:00
|
|
|
```
|
2020-08-13 17:24:35 +02:00
|
|
|
|
2021-01-13 03:31:00 +01:00
|
|
|
# --seed--
|
|
|
|
|
|
|
|
## --seed-contents--
|
|
|
|
|
|
|
|
```html
|
|
|
|
<style type='text/scss'>
|
|
|
|
|
|
|
|
|
|
|
|
.header{
|
|
|
|
text-align: center;
|
|
|
|
}
|
|
|
|
.blog-post, h2 {
|
|
|
|
color: red;
|
|
|
|
}
|
|
|
|
</style>
|
|
|
|
|
|
|
|
<h1 class="header">Learn Sass</h1>
|
|
|
|
<div class="blog-post">
|
|
|
|
<h2>Some random title</h2>
|
|
|
|
<p>This is a paragraph with some random text in it</p>
|
|
|
|
</div>
|
|
|
|
<div class="blog-post">
|
|
|
|
<h2>Header #2</h2>
|
|
|
|
<p>Here is some more random text.</p>
|
|
|
|
</div>
|
|
|
|
<div class="blog-post">
|
|
|
|
<h2>Here is another header</h2>
|
|
|
|
<p>Even more random text within a paragraph</p>
|
|
|
|
</div>
|
|
|
|
```
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
# --solutions--
|
|
|
|
|
2021-01-13 03:31:00 +01:00
|
|
|
```html
|
|
|
|
<style type='text/scss'>
|
|
|
|
$text-color: red;
|
|
|
|
|
|
|
|
.header{
|
|
|
|
text-align: center;
|
|
|
|
}
|
|
|
|
.blog-post, h2 {
|
|
|
|
color: $text-color;
|
|
|
|
}
|
|
|
|
</style>
|
|
|
|
|
|
|
|
<h1 class="header">Learn Sass</h1>
|
|
|
|
<div class="blog-post">
|
|
|
|
<h2>Some random title</h2>
|
|
|
|
<p>This is a paragraph with some random text in it</p>
|
|
|
|
</div>
|
|
|
|
<div class="blog-post">
|
|
|
|
<h2>Header #2</h2>
|
|
|
|
<p>Here is some more random text.</p>
|
|
|
|
</div>
|
|
|
|
<div class="blog-post">
|
|
|
|
<h2>Here is another header</h2>
|
|
|
|
<p>Even more random text within a paragraph</p>
|
|
|
|
</div>
|
|
|
|
```
|