140 lines
2.9 KiB
Markdown
140 lines
2.9 KiB
Markdown
---
|
|
id: bad87fee1348bd9aedf08826
|
|
title: 使用顺时针标记指定元素的内边距
|
|
challengeType: 0
|
|
videoUrl: 'https://scrimba.com/c/cB7mBS9'
|
|
forumTopicId: 18346
|
|
dashedName: use-clockwise-notation-to-specify-the-padding-of-an-element
|
|
---
|
|
|
|
# --description--
|
|
|
|
如果不想每次都要分别声明 `padding-top`、`padding-right`、`padding-bottom`、`padding-left` 属性，可以把它们汇总在一行里面一并声明，像是这样：
|
|
|
|
`padding: 10px 20px 10px 20px;`
|
|
|
|
这四个值按顺时针排序：上、右、下、左，并且设置的效果等同于分别声明每一个方向的内边距。
|
|
|
|
# --instructions--
|
|
|
|
按照顺时针顺序，把 `.blue-box` class 的上内边距以及左内边距 `padding` 设置为 `40px`，右内边距和下内边距则设置为`20px`。
|
|
|
|
# --hints--
|
|
|
|
class 为 `blue-box` 的元素的上内边距 `padding` 应为 `40px`。
|
|
|
|
```js
|
|
assert($('.blue-box').css('padding-top') === '40px');
|
|
```
|
|
|
|
class 为 `blue-box` 的元素的右内边距 `padding` 应为 `20px`。
|
|
|
|
```js
|
|
assert($('.blue-box').css('padding-right') === '20px');
|
|
```
|
|
|
|
class 为 `blue-box` 的元素的下内边距 `padding` 应为 `20px`。
|
|
|
|
```js
|
|
assert($('.blue-box').css('padding-bottom') === '20px');
|
|
```
|
|
|
|
class 为 `blue-box` 的元素的左内边距 `padding` 应为 `40px`。
|
|
|
|
```js
|
|
assert($('.blue-box').css('padding-left') === '40px');
|
|
```
|
|
|
|
应该按照顺时针排序，汇总声明的方式来设置 `blue-box` 的内边距。
|
|
|
|
```js
|
|
assert(
|
|
/\.blue-box\s*{[\s\S]*padding[\s]*:\s*\d+px\s+\d+px\s+\d+px\s+\d+px(;\s*[^}]+\s*}|;?\s*})/.test(
|
|
__helpers.removeCssComments($('style').text())
|
|
)
|
|
);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```html
|
|
<style>
|
|
.injected-text {
|
|
margin-bottom: -25px;
|
|
text-align: center;
|
|
}
|
|
|
|
.box {
|
|
border-style: solid;
|
|
border-color: black;
|
|
border-width: 5px;
|
|
text-align: center;
|
|
}
|
|
|
|
.yellow-box {
|
|
background-color: yellow;
|
|
padding: 20px 40px 20px 40px;
|
|
}
|
|
|
|
.red-box {
|
|
background-color: crimson;
|
|
color: #fff;
|
|
padding: 20px 40px 20px 40px;
|
|
}
|
|
|
|
.blue-box {
|
|
background-color: blue;
|
|
color: #fff;
|
|
}
|
|
</style>
|
|
<h5 class="injected-text">margin</h5>
|
|
|
|
<div class="box yellow-box">
|
|
<h5 class="box red-box">padding</h5>
|
|
<h5 class="box blue-box">padding</h5>
|
|
</div>
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```html
|
|
<style>
|
|
.injected-text {
|
|
margin-bottom: -25px;
|
|
text-align: center;
|
|
}
|
|
|
|
.box {
|
|
border-style: solid;
|
|
border-color: black;
|
|
border-width: 5px;
|
|
text-align: center;
|
|
}
|
|
|
|
.yellow-box {
|
|
background-color: yellow;
|
|
padding: 20px 40px 20px 40px;
|
|
}
|
|
|
|
.red-box {
|
|
background-color: crimson;
|
|
color: #fff;
|
|
padding: 20px 40px 20px 40px;
|
|
}
|
|
|
|
.blue-box {
|
|
background-color: blue;
|
|
color: #fff;
|
|
padding: 40px 20px 20px 40px;
|
|
}
|
|
</style>
|
|
<h5 class="injected-text">margin</h5>
|
|
|
|
<div class="box yellow-box">
|
|
<h5 class="box red-box">padding</h5>
|
|
<h5 class="box blue-box">padding</h5>
|
|
</div>
|
|
```
|