192 lines
5.9 KiB
Markdown
192 lines
5.9 KiB
Markdown
---
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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
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forumTopicId: 16638
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required:
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-
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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。 这些图标可以是网络字体,也可以是一张矢量图。 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 元素的字体大小。
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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 头部增加下列代码即可:
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`<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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不过在这里,已经预先为此页面添加了上述代码。
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`i` 元素起初用于让其它元素具有斜体(italic)的效果,不过现在一般用于显示图标。 可以把 Font Awesome 中的 class 属性添加到 `i` 元素中,让它变成一个图标,比如:
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`<i class="fas fa-info-circle"></i>`
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注意用 `span` 元素展示图标也是可以的。
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# --instructions--
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给 like 按钮添加一个 Font Awesome `thumbs-up` 图标,具体方法是给 `i` 元素添加 `fas` 和 `fa-thumbs-up` class 属性。 确保将 `Like` 文本放在图标旁边。
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# --hints--
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增加一个 class 为 `fas` 和 `fa-thumbs-up` 的 `i` 元素。
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```js
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assert($('i').is('.fas.fa-thumbs-up') || $('span').is('.fas.fa-thumbs-up'));
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```
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`fa-thumbs-up` 图标应该在 Like 按钮中。
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```js
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assert(
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($('i.fa-thumbs-up').parent().text().match(/Like/gi) &&
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$('.btn-primary > i').is('.fas.fa-thumbs-up')) ||
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($('span.fa-thumbs-up').parent().text().match(/Like/gi) &&
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$('.btn-primary > span').is('.fas.fa-thumbs-up'))
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);
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```
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`i` 元素应该在 `button` 元素中。
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```js
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assert(
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$('button').children('i').length > 0 ||
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$('button').children('span').length > 0
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);
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```
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确保图标元素有一个闭合标签。
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```js
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assert(code.match(/<\/i>|<\/span>/g));
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```
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# --seed--
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## --seed-contents--
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```html
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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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<style>
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h2 {
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font-family: Lobster, Monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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</style>
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<div class="container-fluid">
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<div class="row">
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<div class="col-xs-8">
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<h2 class="text-primary text-center">CatPhotoApp</h2>
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</div>
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<div class="col-xs-4">
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<a href="#"><img class="img-responsive thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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</div>
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</div>
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<img src="https://bit.ly/fcc-running-cats" class="img-responsive" alt="Three kittens running towards the camera.">
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<div class="row">
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<div class="col-xs-4">
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<button class="btn btn-block btn-primary">Like</button>
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</div>
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<div class="col-xs-4">
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<button class="btn btn-block btn-info">Info</button>
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</div>
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<div class="col-xs-4">
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<button class="btn btn-block btn-danger">Delete</button>
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</div>
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</div>
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<p>Things cats <span class="text-danger">love:</span></p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor"> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
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<label><input type="checkbox" name="personality"> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Crazy</label>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</div>
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```
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# --solutions--
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```html
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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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<style>
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h2 {
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font-family: Lobster, Monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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</style>
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<div class="container-fluid">
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<div class="row">
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<div class="col-xs-8">
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<h2 class="text-primary text-center">CatPhotoApp</h2>
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</div>
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<div class="col-xs-4">
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<a href="#"><img class="img-responsive thick-green-border" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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</div>
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</div>
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<img src="https://bit.ly/fcc-running-cats" class="img-responsive" alt="Three kittens running towards the camera.">
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<div class="row">
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<div class="col-xs-4">
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<button class="btn btn-block btn-primary"><i class="fas fa-thumbs-up"></i> Like</button>
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</div>
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<div class="col-xs-4">
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<button class="btn btn-block btn-info">Info</button>
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</div>
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<div class="col-xs-4">
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<button class="btn btn-block btn-danger">Delete</button>
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</div>
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</div>
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<p>Things cats <span class="text-danger">love:</span></p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor"> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label>
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<label><input type="checkbox" name="personality"> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Crazy</label>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</div>
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```
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