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---
id: bad88fee1348ce8acef08815
title: 使用 Bootstrap Grid 並排放置元素
challengeType: 0
forumTopicId: 18371
dashedName: use-the-bootstrap-grid-to-put-elements-side-by-side
---
# --description--
Bootstrap 具有一套 12 列的響應式柵格系統,可以輕鬆的將多個元素放入一行並指定它們的相對寬度。 Bootstrap 的大部分 class 屬性都可以應用在 `div` 元素上。
Bootstrap 的列寬取決於用戶的屏幕寬度。 比如,手機有着窄屏幕而筆記本電腦有者更大的屏幕.
就拿 Bootstrap 的 `col-md-*` class 來說。 在這裏, `md` 表示 medium (中等的), 而 `*` 是一個數字,說明了這個元素佔有多少個列寬度。 這個例子就是指定了中等大小屏幕(例如筆記本電腦)下元素所佔的列寬度。
在 Cat Photo App 中,將使用 `col-xs-*` , 其中 `xs` 是 extra small 的縮寫 (比如窄屏手機屏幕), `*` 是填寫的數字,代表一行中的元素該佔多少列寬。
將 `Like` , `Info` 和 `Delete` 三個按鈕並排放入一個 `<div class="row">` 元素中,然後每個按鈕都各用一個 `<div class="col-xs-4">` 元素包裹起來。
當 `div` 元素設置了 `row` class 之後,那幾個按鈕便會嵌入其中了。
# --hints--
所有按鈕都需要嵌入到同一個 `div` 元素中, 並且該元素包含 `row` class 屬性。
```js
assert($('div.row:has(button)').length > 0);
```
每個 Bootstrap 按鈕都需要嵌入各自的 `div` 元素,並且該元素包含 class 屬性 `col-xs-4` 。
```js
assert($('div.col-xs-4:has(button)').length > 2);
```
確保每一個 `button` 元素都有一個閉合標籤。
```js
assert(
code.match(/< \/button > /g) &&
code.match(/< button / g ) & &
code.match(/< \/button > /g).length === code.match(/< button / g ). length
);
```
確保每一個 `div` 元素都有一個閉合標籤。
```js
assert(
code.match(/< \/div > /g) &&
code.match(/< div / g ) & &
code.match(/< \/div > /g).length === code.match(/< div / g ). length
);
```
# --seed--
## --seed-contents--
```html
< link href = "https://fonts.googleapis.com/css?family=Lobster" rel = "stylesheet" type = "text/css" >
< style >
.red-text {
color: red;
}
h2 {
font-family: Lobster, Monospace;
}
p {
font-size: 16px;
font-family: Monospace;
}
.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}
.smaller-image {
width: 100px;
}
< / style >
< div class = "container-fluid" >
< h2 class = "red-text text-center" > CatPhotoApp< / h2 >
< p > Click here for < a href = "#" > cat photos< / a > .< / p >
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< a href = "#" > < img class = "smaller-image thick-green-border" src = "https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt = "A cute orange cat lying on its back." > < / a >
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< img src = "https://cdn.freecodecamp.org/curriculum/cat-photo-app/running-cats.jpg" class = "img-responsive" alt = "Three kittens running towards the camera." >
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< button class = "btn btn-block btn-primary" > Like< / button >
< button class = "btn btn-block btn-info" > Info< / button >
< button class = "btn btn-block btn-danger" > Delete< / button >
< p > Things cats love:< / p >
< ul >
< li > cat nip< / li >
< li > laser pointers< / li >
< li > lasagna< / li >
< / ul >
< p > Top 3 things cats hate:< / p >
< ol >
< li > flea treatment< / li >
< li > thunder< / li >
< li > other cats< / li >
< / ol >
< form action = "https://freecatphotoapp.com/submit-cat-photo" >
< label > < input type = "radio" name = "indoor-outdoor" > Indoor< / label >
< label > < input type = "radio" name = "indoor-outdoor" > Outdoor< / label >
< label > < input type = "checkbox" name = "personality" > Loving< / label >
< label > < input type = "checkbox" name = "personality" > Lazy< / label >
< label > < input type = "checkbox" name = "personality" > Crazy< / label >
< input type = "text" placeholder = "cat photo URL" required >
< button type = "submit" > Submit< / button >
< / form >
< / div >
```
# --solutions--
```html
< link href = "https://fonts.googleapis.com/css?family=Lobster" rel = "stylesheet" type = "text/css" >
< style >
.red-text {
color: red;
}
h2 {
font-family: Lobster, Monospace;
}
p {
font-size: 16px;
font-family: Monospace;
}
.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}
.smaller-image {
width: 100px;
}
< / style >
< div class = "container-fluid" >
< h2 class = "red-text text-center" > CatPhotoApp< / h2 >
< p > Click here for < a href = "#" > cat photos< / a > .< / p >
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< a href = "#" > < img class = "smaller-image thick-green-border" src = "https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt = "A cute orange cat lying on its back." > < / a >
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< img src = "https://cdn.freecodecamp.org/curriculum/cat-photo-app/running-cats.jpg" class = "img-responsive" alt = "Three kittens running towards the camera." >
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< div class = "row" >
< div class = "col-xs-4" >
< button class = "btn btn-block btn-primary" > Like< / button >
< / div >
< div class = "col-xs-4" >
< button class = "btn btn-block btn-info" > Info< / button >
< / div >
< div class = "col-xs-4" >
< button class = "btn btn-block btn-danger" > Delete< / button >
< / div >
< / div >
< p > Things cats love:< / p >
< ul >
< li > cat nip< / li >
< li > laser pointers< / li >
< li > lasagna< / li >
< / ul >
< p > Top 3 things cats hate:< / p >
< ol >
< li > flea treatment< / li >
< li > thunder< / li >
< li > other cats< / li >
< / ol >
< form action = "https://freecatphotoapp.com/submit-cat-photo" >
< label > < input type = "radio" name = "indoor-outdoor" > Indoor< / label >
< label > < input type = "radio" name = "indoor-outdoor" > Outdoor< / label >
< label > < input type = "checkbox" name = "personality" > Loving< / label >
< label > < input type = "checkbox" name = "personality" > Lazy< / label >
< label > < input type = "checkbox" name = "personality" > Crazy< / label >
< input type = "text" placeholder = "cat photo URL" required >
< button type = "submit" > Submit< / button >
< / form >
< / div >
```