186 lines
4.9 KiB
Markdown
186 lines
4.9 KiB
Markdown
---
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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
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<button class="btn btn-default">Submit</button>
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```
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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
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<button class="btn btn-default btn-block">Submit</button>
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```
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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
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assert($('button').hasClass('btn') && $('button').hasClass('btn-default'));
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```
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按钮应该有 `btn-block` class。
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```js
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assert($('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
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assert(
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code.match(/<\/button>/g) &&
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code.match(/<button/g) &&
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code.match(/<\/button>/g).length === code.match(/<button/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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.red-text {
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color: red;
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}
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h2 {
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font-family: Lobster, Monospace;
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}
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p {
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font-size: 16px;
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font-family: 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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.smaller-image {
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width: 100px;
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}
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</style>
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<div class="container-fluid">
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<h2 class="red-text text-center">CatPhotoApp</h2>
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<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>
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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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.red-text {
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color: red;
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}
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h2 {
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font-family: Lobster, Monospace;
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}
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p {
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font-size: 16px;
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font-family: 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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.smaller-image {
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width: 100px;
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}
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</style>
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<div class="container-fluid">
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<h2 class="red-text text-center">CatPhotoApp</h2>
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<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>
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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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