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---
id: bad87fee1348bd9aedd08845
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title: 在按钮中添加字体图标
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challengeType: 0
forumTopicId: 16638
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required:
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-
link: 'https://use.fontawesome.com/releases/v5.8.1/css/all.css'
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raw: true
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dashedName: add-font-awesome-icons-to-our-buttons
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---
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# --description--
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Font Awesome 是一个非常便利的图标库。 我们可以通过 webfont 或矢量图的方式来使用这些图标。 这些图标就和字体一样, 不仅能通过像素单位指定它们的大小,它们也同样会继承父级 HTML 元素的字号。
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可以将 Font Awesome 图标库添加至任何一个 web app 中,方法很简单,只需要在 HTML head 标签中添加以下代码即可:
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```html
< link rel = "stylesheet" href = "https://use.fontawesome.com/releases/v5.8.1/css/all.css" integrity = "sha384-50oBUHEmvpQ+1lW4y57PTFmhCaXp0ML5d60M1M7uH2+nqUivzIebhndOJK28anvf" crossorigin = "anonymous" >
```
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在这个挑战中,我们已经为你在页面上添加好了 Font Awesome 图标库。
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`i` 元素原本是用来表示斜体文字内容的;不过现在,用它来表示图标也很常见。 只需要为 `i` 元素添加相应的 class 就可以让它展示图标,比如:
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```html
< i class = "fas fa-info-circle" > < / i >
```
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同时,我们也可以使用 `span` 元素来展示图标。
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# --instructions--
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请使用 Font Awesome 来为我们的点赞按钮添加一个 `thumbs-up` 图标,只需添加一个 class 包含 `fas` 和 `fa-thumbs-up` 的 `i` 元素即可。 同时,请记得保留图标之后的文字内容 `Like` 。
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# --hints--
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应添加一个 class 包含 `fas` 和 `fa-thumbs-up` 的 `i` 元素。
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```js
assert($('i').is('.fas.fa-thumbs-up') || $('span').is('.fas.fa-thumbs-up'));
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```
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Like 按钮中应包含 `fa-thumbs-up` 图标。
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```js
assert(
($('i.fa-thumbs-up').parent().text().match(/Like/gi) & &
$('.btn-primary > i').is('.fas.fa-thumbs-up')) ||
($('span.fa-thumbs-up').parent().text().match(/Like/gi) & &
$('.btn-primary > span').is('.fas.fa-thumbs-up'))
);
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```
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`i` 元素应出现在 `button` 元素内。
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```js
assert(
$('button').children('i').length > 0 ||
$('button').children('span').length > 0
);
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```
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表示图标的元素应有闭合标签。
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```js
assert(code.match(/< \/i > |< \/span > /g));
```
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# --seed--
## --seed-contents--
```html
< link href = "https://fonts.googleapis.com/css?family=Lobster" rel = "stylesheet" type = "text/css" >
< style >
h2 {
font-family: Lobster, Monospace;
}
.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}
< / style >
< div class = "container-fluid" >
< div class = "row" >
< div class = "col-xs-8" >
< h2 class = "text-primary text-center" > CatPhotoApp< / h2 >
< / div >
< div class = "col-xs-4" >
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< a href = "#" > < img class = "img-responsive 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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< / div >
< / div >
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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 < span class = "text-danger" > love:< / span > < / 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 >
h2 {
font-family: Lobster, Monospace;
}
.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}
< / style >
< div class = "container-fluid" >
< div class = "row" >
< div class = "col-xs-8" >
< h2 class = "text-primary text-center" > CatPhotoApp< / h2 >
< / div >
< div class = "col-xs-4" >
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< a href = "#" > < img class = "img-responsive 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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< / div >
< / div >
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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" > < i class = "fas fa-thumbs-up" > < / i > 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 < span class = "text-danger" > love:< / span > < / 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 >
```