2.9 KiB
2.9 KiB
id | title | challengeType | videoUrl | localeTitle |
---|---|---|---|---|
587d78a8367417b2b2512ae4 | Make a CSS Heartbeat using an Infinite Animation Count | 0 | 使用无限动画计数制作CSS心跳 |
Description
animation-iteration-count
属性的连续动画示例,该属性使用您在之前的挑战中设计的心脏。一秒长的心跳动画由两个动画片段组成。的heart
元件(包括:before
和:after
片)的动画使用改变大小transform
特性,并且背景div
是动画使用改变其颜色background
属性。 Instructions
back
类和heart
类添加animation-iteration-count
属性并将值设置为无限来保持心脏跳动。 heart:before
和heart:after
选择器heart:after
不需要任何动画属性。 Tests
tests:
- text: <code>heart</code>类的<code>animation-iteration-count</code>属性应具有无限值。
testString: 'assert($(".heart").css("animation-iteration-count") == "infinite", "The <code>animation-iteration-count</code> property for the <code>heart</code> class should have a value of infinite.");'
- text: <code>back</code>类的<code>animation-iteration-count</code>属性应具有无限值。
testString: 'assert($(".back").css("animation-iteration-count") == "infinite", "The <code>animation-iteration-count</code> property for the <code>back</code> class should have a value of infinite.");'
Challenge Seed
<style>
.back {
position: fixed;
padding: 0;
margin: 0;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: white;
animation-name: backdiv;
animation-duration: 1s;
}
.heart {
position: absolute;
margin: auto;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: pink;
height: 50px;
width: 50px;
transform: rotate(-45deg);
animation-name: beat;
animation-duration: 1s;
}
.heart:after {
background-color: pink;
content: "";
border-radius: 50%;
position: absolute;
width: 50px;
height: 50px;
top: 0px;
left: 25px;
}
.heart:before {
background-color: pink;
content: "";
border-radius: 50%;
position: absolute;
width: 50px;
height: 50px;
top: -25px;
left: 0px;
}
@keyframes backdiv {
50% {
background: #ffe6f2;
}
}
@keyframes beat {
0% {
transform: scale(1) rotate(-45deg);
}
50% {
transform: scale(0.6) rotate(-45deg);
}
}
</style>
<div class="back"></div>
<div class="heart"></div>
Solution
// solution required