106 lines
2.8 KiB
Markdown
106 lines
2.8 KiB
Markdown
---
|
||
id: 587d78a8367417b2b2512ae6
|
||
title: Animate Multiple Elements at Variable Rates
|
||
challengeType: 0
|
||
videoUrl: ''
|
||
localeTitle: 以可变速率动画多个元素
|
||
---
|
||
|
||
## Description
|
||
<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>
|
||
|
||
## Instructions
|
||
<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>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: 具有<code>star-1</code>的星的<code>animation-duration</code>属性应保持为1秒。
|
||
testString: 'assert($(".star-1").css("animation-duration") == "1s", "The <code>animation-duration</code> property for the star with class <code>star-1</code> should remain at 1s.");'
|
||
- text: <code>star-2</code>的星的<code>animation-duration</code>属性应为0.9秒。
|
||
testString: 'assert($(".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.");'
|
||
- text: <code>star-3</code>的星的<code>animation-duration</code>属性应为1.1秒。
|
||
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.");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='html-seed'>
|
||
|
||
```html
|
||
<style>
|
||
.stars {
|
||
background-color: white;
|
||
height: 30px;
|
||
width: 30px;
|
||
border-radius: 50%;
|
||
animation-iteration-count: infinite;
|
||
}
|
||
|
||
.star-1 {
|
||
margin-top: 15%;
|
||
margin-left: 60%;
|
||
animation-duration: 1s;
|
||
animation-name: twinkle;
|
||
}
|
||
|
||
.star-2 {
|
||
margin-top: 25%;
|
||
margin-left: 25%;
|
||
animation-duration: 1s;
|
||
animation-name: twinkle;
|
||
}
|
||
|
||
.star-3 {
|
||
margin-top: 10%;
|
||
margin-left: 50%;
|
||
animation-duration: 1s;
|
||
animation-name: twinkle;
|
||
}
|
||
|
||
@keyframes twinkle {
|
||
20% {
|
||
transform: scale(0.5);
|
||
opacity: 0.5;
|
||
}
|
||
}
|
||
|
||
#back {
|
||
position: fixed;
|
||
padding: 0;
|
||
margin: 0;
|
||
top: 0;
|
||
left: 0;
|
||
width: 100%;
|
||
height: 100%;
|
||
background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
|
||
}
|
||
</style>
|
||
|
||
<div id="back"></div>
|
||
<div class="star-1 stars"></div>
|
||
<div class="star-2 stars"></div>
|
||
<div class="star-3 stars"></div>
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|