106 lines
2.8 KiB
Markdown
106 lines
2.8 KiB
Markdown
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---
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id: 587d78a8367417b2b2512ae6
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title: Animate Multiple Elements at Variable Rates
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challengeType: 0
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videoUrl: ''
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localeTitle: 以可变速率动画多个元素
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---
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## Description
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<section id="description">在之前的挑战中，您通过更改其<code>@keyframes</code>规则来更改两个相似动画元素的动画速率。您可以通过操纵多个元素的<code>animation-duration</code>来实现相同的目标。在代码编辑器中运行的动画中，天空中有三个“星星”在连续循环中以相同的速率闪烁。要使它们以不同的速率闪烁，可以将<code>animation-duration</code>属性设置为每个元素的不同值。 </section>
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## Instructions
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<section id="instructions">将类别为<code>star-1</code> ， <code>star-2</code>和<code>star-3</code>的元素的<code>animation-duration</code>设置为1s，0.9s和1.1s。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 具有<code>star-1</code>的星的<code>animation-duration</code>属性应保持为1秒。
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testString: 'assert($(".star-1").css("animation-duration") == "1s", "The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.");'
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- text: <code>star-2</code>的星的<code>animation-duration</code>属性应为0.9秒。
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testString: 'assert($(".star-2").css("animation-duration") == "0.9s", "The <code>animation-duration</code> property for the star with class <code>star-2</code> should be 0.9s.");'
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- text: <code>star-3</code>的星的<code>animation-duration</code>属性应为1.1秒。
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testString: 'assert($(".star-3").css("animation-duration") == "1.1s", "The <code>animation-duration</code> property for the star with class <code>star-3</code> should be 1.1s.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style>
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.stars {
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background-color: white;
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height: 30px;
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width: 30px;
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border-radius: 50%;
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animation-iteration-count: infinite;
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}
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.star-1 {
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margin-top: 15%;
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margin-left: 60%;
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animation-duration: 1s;
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animation-name: twinkle;
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}
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.star-2 {
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margin-top: 25%;
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margin-left: 25%;
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animation-duration: 1s;
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animation-name: twinkle;
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}
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.star-3 {
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margin-top: 10%;
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margin-left: 50%;
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animation-duration: 1s;
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animation-name: twinkle;
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}
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@keyframes twinkle {
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20% {
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transform: scale(0.5);
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opacity: 0.5;
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}
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}
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#back {
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position: fixed;
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padding: 0;
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margin: 0;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
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}
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</style>
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<div id="back"></div>
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<div class="star-1 stars"></div>
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<div class="star-2 stars"></div>
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<div class="star-3 stars"></div>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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