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freeCodeCamp/curriculum/challenges/chinese-traditional/01-responsive-web-design/css-flexbox/use-the-flex-direction-property-to-make-a-row.md

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---
id: 587d78ab367417b2b2512af2
title: 使用 flex-direction 屬性創建一個行
challengeType: 0
videoUrl: 'https://scrimba.com/p/pVaDAv/cBEkbfJ'
forumTopicId: 301110
dashedName: use-the-flex-direction-property-to-make-a-row
---
# --description--
給元素添加 `display: flex` 屬性可以讓它變成 flex 容器, 然後可以讓元素的項目排列成行或列。 只要給父元素添加 `flex-direction` 屬性,並把屬性值設置爲 row 或 column即可橫向排列或縱向排列它的所有子元素。 創建一行將使子項水平對齊,創建一列將使子項垂直對齊。
`flex-direction` 的其他可選值還有 `row-reverse``column-reverse`
**注意:** `flex-direction` 的默認值爲 `row`
# --instructions--
請爲 `#box-container` 添加 CSS 屬性 `flex-direction`,將其值設爲 `row-reverse`
# --hints--
`#box-container` 元素應有 `flex-direction` 屬性,其屬性值應爲 `row-reverse`
```js
assert($('#box-container').css('flex-direction') == 'row-reverse');
```
# --seed--
## --seed-contents--
```html
<style>
#box-container {
display: flex;
height: 500px;
}
#box-1 {
background-color: dodgerblue;
width: 50%;
height: 50%;
}
#box-2 {
background-color: orangered;
width: 50%;
height: 50%;
}
</style>
<div id="box-container">
<div id="box-1"></div>
<div id="box-2"></div>
</div>
```
# --solutions--
```html
<style>
#box-container {
display: flex;
height: 500px;
flex-direction: row-reverse;
}
#box-1 {
background-color: dodgerblue;
width: 50%;
height: 50%;
}
#box-2 {
background-color: orangered;
width: 50%;
height: 50%;
}
</style>
<div id="box-container">
<div id="box-1"></div>
<div id="box-2"></div>
</div>
```