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---
id: bad87fee1348cd8acef08812
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title: 创建一个 Bootstrap 块级元素按钮
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challengeType: 0
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forumTopicId: 16810
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dashedName: create-a-block-element-bootstrap-button
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---
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# --description--
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一般情况下,`btn` 和 `btn-default` 两个 classes 修饰的 `button` 元素宽度与它包含的文本相同, 举个例子:
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```html
< button class = "btn btn-default" > Submit< / button >
```
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这个按钮的宽度应该和文本 `Submit` 的宽度相同。
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< button class = 'btn btn-default' > 提交< / button >
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通过为按钮添加 class 属性 `btn-block` 使其成为块级元素,按钮会伸展并填满页面的整个水平空间,后续的元素会流到这个块级元素的下方,即 "另起一行"。
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```html
< button class = "btn btn-default btn-block" > Submit< / button >
```
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这个按钮会 100% 占满所有的可用宽度。
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< button class = 'btn btn-default btn-block' > 提交< / button >
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注意,这些按钮仍然需要 `btn` 这个 class。
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给刚创建的 Bootstrap 按钮添加 Bootstrap 的 `btn-block` class。
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# --hints--
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按钮仍然应该有 `btn` 和 `btn-default` class。
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```js
assert($('button').hasClass('btn') & & $('button').hasClass('btn-default'));
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```
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按钮应该有 `btn-block` class。
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```js
assert($('button').hasClass('btn-block'));
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```
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所有 `button` 元素都应该有闭合标签。
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```js
assert(
code.match(/< \/button > /g) &&
code.match(/< button / g ) & &
code.match(/< \/button > /g).length === code.match(/< button / g ). length
);
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```
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# --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-default" > Like< / 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 >
```
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# --solutions--
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```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-default" > Like< / 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 >
```