120 lines
2.9 KiB
Markdown
120 lines
2.9 KiB
Markdown
---
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id: 587d78a8367417b2b2512ae4
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title: Make a CSS Heartbeat using an Infinite Animation Count
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challengeType: 0
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videoUrl: ''
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localeTitle: 使用无限动画计数制作CSS心跳
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---
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## Description
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<section id="description">这是一个带有<code>animation-iteration-count</code>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<code>heart</code>元件（包括<code>:before</code>和<code>:after</code>片）的动画使用改变大小<code>transform</code>特性，并且背景<code>div</code>是动画使用改变其颜色<code>background</code>属性。 </section>
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## Instructions
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<section id="instructions">通过为<code>back</code>类和<code>heart</code>类添加<code>animation-iteration-count</code>属性并将值设置为无限来保持心脏跳动。 <code>heart:before</code>和<code>heart:after</code>选择器<code>heart:after</code>不需要任何动画属性。 </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: <code>heart</code>类的<code>animation-iteration-count</code>属性应具有无限值。
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testString: 'assert($(".heart").css("animation-iteration-count") == "infinite", "The <code>animation-iteration-count</code> property for the <code>heart</code> class should have a value of infinite.");'
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- text: <code>back</code>类的<code>animation-iteration-count</code>属性应具有无限值。
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testString: 'assert($(".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.");'
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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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.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: white;
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animation-name: backdiv;
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animation-duration: 1s;
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}
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.heart {
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position: absolute;
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margin: auto;
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top: 0;
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right: 0;
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bottom: 0;
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left: 0;
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background-color: pink;
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height: 50px;
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width: 50px;
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transform: rotate(-45deg);
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animation-name: beat;
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animation-duration: 1s;
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}
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.heart:after {
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background-color: pink;
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content: "";
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border-radius: 50%;
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position: absolute;
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width: 50px;
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height: 50px;
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top: 0px;
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left: 25px;
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}
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.heart:before {
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background-color: pink;
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content: "";
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border-radius: 50%;
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position: absolute;
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width: 50px;
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height: 50px;
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top: -25px;
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left: 0px;
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}
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@keyframes backdiv {
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50% {
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background: #ffe6f2;
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}
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}
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@keyframes beat {
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0% {
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transform: scale(1) rotate(-45deg);
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}
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50% {
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transform: scale(0.6) rotate(-45deg);
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}
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}
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</style>
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<div class="back"></div>
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<div class="heart"></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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