2018-10-10 22:03:03 +00:00
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---
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id: bad87fee1348bd9acdf08812
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2020-12-16 07:37:30 +00:00
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title: 调整图片的大小
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2018-10-10 22:03:03 +00:00
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challengeType: 0
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2019-12-13 05:47:57 +00:00
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videoUrl: 'https://scrimba.com/c/cM9MmCP'
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forumTopicId: 18282
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2021-01-13 02:31:00 +00:00
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dashedName: size-your-images
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2021-02-06 04:42:36 +00:00
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CSS 的 `width` 属性可以控制元素的宽度。 和设置文本字号一样,我们会以 `px`(像素)为单位来设置图片的宽度。
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2020-12-16 07:37:30 +00:00
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2021-02-06 04:42:36 +00:00
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例如,如果你想创建一个叫 `larger-image` 的 CSS class,来控制 HTML 元素的宽度为 500px,就可以这样写:
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2019-12-13 05:47:57 +00:00
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```html
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<style>
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.larger-image {
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width: 500px;
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}
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</style>
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```
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2020-12-16 07:37:30 +00:00
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# --instructions--
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2018-10-10 22:03:03 +00:00
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2021-02-06 04:42:36 +00:00
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创建一个叫 `smaller-image` 的 CSS class,并用它来设置图片宽度为 100px。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2021-02-06 04:42:36 +00:00
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`img` 元素应包含 `smaller-image` class。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(
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$("img[src='https://bit.ly/fcc-relaxing-cat']").attr('class') ===
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'smaller-image'
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);
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2018-10-10 22:03:03 +00:00
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```
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2021-01-08 19:20:48 +00:00
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图片宽度应为 100px。
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2018-10-10 22:03:03 +00:00
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```js
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2021-02-06 04:42:36 +00:00
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assert(
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$('img').width() < 200 &&
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code.match(/\.smaller-image\s*{\s*width\s*:\s*100px\s*(;\s*}|})/i)
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-08-13 15:24:35 +00:00
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2021-01-13 02:31:00 +00:00
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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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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img 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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<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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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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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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</main>
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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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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.smaller-image {
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width: 100px;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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2021-02-06 04:42:36 +00:00
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2021-01-13 02:31:00 +00:00
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<a href="#"><img class="smaller-image" src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
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2021-02-06 04:42:36 +00:00
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2021-01-13 02:31:00 +00:00
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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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</div>
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2021-02-06 04:42:36 +00:00
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2021-01-13 02:31:00 +00:00
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<form action="https://freecatphotoapp.com/submit-cat-photo">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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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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</main>
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```
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