77 lines
1.7 KiB
Markdown
77 lines
1.7 KiB
Markdown
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---
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id: 587d78b1367417b2b2512b09
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title: 使圖片自適應設備尺寸
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challengeType: 0
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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 來讓圖片自適應其實很簡單。 你只需要給圖片添加這些屬性:
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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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設置 `max-width` 值爲 `100%` 可確保圖片不超出父容器的範圍；設置 `height` 屬性爲 `auto` 可以保持圖片的原始寬高比。
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# --instructions--
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給 `responsive-img` 添加樣式規則，使其成爲響應式的圖片。 它不應該超出父容器（在本例中，即預覽窗口）的範圍，並保持寬高比不變。 添加代碼後，拖動瀏覽器窗口，看看圖片發生什麼變化。
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# --hints--
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`responsive-img` 類應將 `max-width` 設置爲 `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` 類應將 `height` 設置爲 `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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