96 lines
1.7 KiB
Markdown
96 lines
1.7 KiB
Markdown
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---
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id: 587d78a7367417b2b2512ae2
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title: 通過從左到右淡化元素來創建視覺方向
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cGJqqAE'
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forumTopicId: 301054
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dashedName: create-visual-direction-by-fading-an-element-from-left-to-right
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---
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# --description--
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在本挑戰中，我們需要改變動畫元素的 `opacity` 屬性值，使其在到達屏幕右側時漸隱。
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在示例動畫中，具有漸變背景的圓形元素在 `@keyframes` 爲 50% 的節點向右移動。
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# --instructions--
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使用 id 選擇器選擇 id 爲 `ball` 的元素，在 @keyframes 爲 `50%` 的節點裏添加 `opacity` 屬性並設置屬性值爲 0.1，使其在向右移動時漸隱。
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# --hints--
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`keyframes` 爲 50% 的節點處應設置 `opacity` 屬性值爲 0.1，以使其漸隱。
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```js
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assert(
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code.match(
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/@keyframes fade\s*?{\s*?50%\s*?{\s*?(?:left:\s*?60%;\s*?opacity:\s*?0?\.1;|opacity:\s*?0?\.1;\s*?left:\s*?60%;)/gi
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)
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);
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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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#ball {
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width: 70px;
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height: 70px;
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margin: 50px auto;
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position: fixed;
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left: 20%;
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border-radius: 50%;
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background: linear-gradient(
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35deg,
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#ccffff,
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#ffcccc
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);
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animation-name: fade;
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animation-duration: 3s;
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}
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@keyframes fade {
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50% {
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left: 60%;
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}
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}
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</style>
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<div id="ball"></div>
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```
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# --solutions--
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```html
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<style>
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#ball {
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width: 70px;
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height: 70px;
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margin: 50px auto;
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position: fixed;
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left: 20%;
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border-radius: 50%;
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background: linear-gradient(
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35deg,
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#ccffff,
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#ffcccc
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);
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animation-name: fade;
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animation-duration: 3s;
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}
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@keyframes fade {
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50% {
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left: 60%;
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opacity: 0.1;
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}
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}
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</style>
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<div id="ball"></div>
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```
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