2.8 KiB
2.8 KiB
id | title | challengeType | videoUrl | localeTitle |
---|---|---|---|---|
587d78a8367417b2b2512ae6 | Animate Multiple Elements at Variable Rates | 0 | 以可变速率动画多个元素 |
Description
@keyframes
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animation-duration
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animation-duration
属性设置为每个元素的不同值。 Instructions
star-1
, star-2
和star-3
的元素的animation-duration
设置为1s,0.9s和1.1s。 Tests
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.");'
Challenge Seed
<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>
Solution
// solution required