78 lines
1.7 KiB
Markdown
78 lines
1.7 KiB
Markdown
---
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id: 587d78b1367417b2b2512b09
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title: 使图片自适应设备尺寸
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challengeType: 0
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videoUrl: 'https://scrimba.com/p/pzrPu4/cz763UD'
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forumTopicId: 301140
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dashedName: make-an-image-responsive
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---
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# --description--
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用 CSS 来让图片自适应其实很简单。 你只需要给图片添加这些属性:
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```css
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img {
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max-width: 100%;
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height: auto;
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}
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```
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设置 `max-width` 值为 `100%` 可确保图片不超出父容器的范围；设置 `height` 属性为 `auto` 可以保持图片的原始宽高比。
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# --instructions--
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给 `responsive-img` 添加样式规则，使其成为响应式的图片。 它不应该超出父容器（在本例中，即预览窗口）的范围，并保持宽高比不变。 添加代码后，拖动浏览器窗口，看看图片发生什么变化。
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# --hints--
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`responsive-img` 类应将 `max-width` 设置为 `100%`。
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```js
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assert(getComputedStyle($('.responsive-img')[0]).maxWidth === '100%');
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```
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`responsive-img` 类应将 `height` 设置为 `auto`。
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```js
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assert(code.match(/height:\s*?auto;/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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<style>
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.responsive-img {
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}
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img {
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width: 600px;
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}
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</style>
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<img class="responsive-img" src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">
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<img src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">
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```
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# --solutions--
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```html
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<style>
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.responsive-img {
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max-width: 100%;
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height: auto;
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}
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img {
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width: 600px;
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}
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</style>
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<img class="responsive-img" src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">
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<img src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">
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```
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