2018-10-10 22:03:03 +00:00
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---
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id: 587d78b1367417b2b2512b09
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2020-12-16 07:37:30 +00:00
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title: 使图片根据设备尺寸自如响应
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2018-10-10 22:03:03 +00:00
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challengeType: 0
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2020-02-11 13:30:05 +00:00
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videoUrl: 'https://scrimba.com/c/cPp7VfD'
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forumTopicId: 1
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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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2020-03-03 13:41:15 +00:00
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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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2020-02-11 13:30:05 +00:00
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2020-03-03 13:41:15 +00:00
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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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2020-12-16 07:37:30 +00:00
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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` 保持图片的原始宽高比。
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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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# --instructions--
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2020-02-11 13:30:05 +00:00
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2020-03-03 13:41:15 +00:00
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给 `responsive-img` 添加样式规则,使其成为响应式。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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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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2020-12-16 07:37:30 +00:00
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`responsive-img` 类应设置 `max-width` 为 `100%`。
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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(getComputedStyle($('.responsive-img')[0]).maxWidth === '100%');
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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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`responsive-img` 类应设置 `height` 为 `auto`。
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2020-03-03 13:41:15 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert(code.match(/height:\s*?auto;/g));
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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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# --solutions--
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2020-02-11 13:30:05 +00:00
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