186 lines
5.3 KiB
Markdown
186 lines
5.3 KiB
Markdown
---
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id: bad87fee1348bd9aedf08845
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title: 使用 span 创建行内元素
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challengeType: 0
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forumTopicId: 18370
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dashedName: use-a-span-to-target-inline-elements
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---
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# --description--
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可以使用 span 标签来创建行内元素。 还记得怎么使用 `btn-block` class 来创建填满整行的按钮吗?
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<button class='btn' style='background-color: rgb(0, 100, 0); color: rgb(255, 255, 255);'>普通按钮</button>
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<button class='btn btn-block' style='background-color: rgb(0, 100, 0); color: rgb(255, 255, 255);'>块级按钮</button>
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上面的例子就是 "inline" (行内)元素和 "block" (块级)元素的区别。
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通过使用行内元素 `span`,可以把不同的元素放在同一行,甚至能为一行的不同部分指定不同样式。
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使用一个 `span` 元素,将文本 `love` 嵌入现在包含文本 `Things cats love` 的 `p` 元素中。 然后给 `span` 元素设置 class `text-danger`,使文本变成红色。
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对含有文本 `Top 3 things cats hate` 的 `p` 元素这样处理:
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```html
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<p>Top 3 things cats <span class="text-danger">hate:</span></p>
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```
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# --hints--
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`span` 元素应该在 `p` 元素内。
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```js
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assert($('p span') && $('p span').length > 0);
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```
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`span` 元素应该有文本 `love`。
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```js
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assert(
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$('p span') &&
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$('p span').text().match(/love/i) &&
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!$('p span')
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.text()
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.match(/Things cats/i)
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);
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```
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`span` 元素应该有 `text-danger` class。
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```js
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assert($('span').hasClass('text-danger'));
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```
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`span` 元素应该有一个闭合标签。
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```js
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assert(
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code.match(/<\/span>/g) &&
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code.match(/<span/g) &&
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code.match(/<\/span>/g).length === code.match(/<span/g).length
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);
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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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<h2 class="text-primary text-center">CatPhotoApp</h2>
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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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<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">
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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 love:</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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<h2 class="text-primary text-center">CatPhotoApp</h2>
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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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<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">
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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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