freeCodeCamp/make-an-image-responsive.md at 6f405f70bc8ca3e7050f76b9164f3df1cf6e346b

Files

Oliver Eyton-Williams dec409a4bd fix: s/localeTitle/title/g

2020-10-06 23:10:08 +05:30

2.0 KiB

Raw Blame History

id, challengeType, videoUrl, forumTopicId, title

id	challengeType	videoUrl	forumTopicId	title
587d78b1367417b2b2512b09	0	https://scrimba.com/c/cPp7VfD	1	使图片根据设备尺寸自如响应

Description

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:

img {
  max-width: 100%;
  height: auto;
}

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。

Instructions

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。

Tests

tests:
  - text: <code>responsive-img</code> 类应设置 <code>max-width</code> 为 <code>100%</code>。
    testString: assert(getComputedStyle($('.responsive-img')[0]).maxWidth === '100%');
  - text: <code>responsive-img</code> 类应设置 <code>height</code> 为 <code>auto</code>。
    testString: assert(code.match(/height:\s*?auto;/g));

Challenge Seed

<style>
.responsive-img {


}

img {
  width: 600px;
}
</style>

<img class="responsive-img" src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">
<img src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">

Solution

<style>
.responsive-img {
  max-width: 100%;
  height: auto;
}

img {
  width: 600px;
}
</style>

<img class="responsive-img" src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">
<img src="https://s3.amazonaws.com/freecodecamp/FCCStickerPack.jpg" alt="freeCodeCamp stickers set">

2.0 KiB Raw Blame History