freeCodeCamp/make-a-css-heartbeat-using-an-infinite-animation-count.md at dec409a4bd667e4979305cc1e86e0702bbc2c707

Oliver Eyton-Williams dec409a4bd fix: s/localeTitle/title/g

2020-10-06 23:10:08 +05:30

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id, challengeType, videoUrl, forumTopicId, title

id	challengeType	videoUrl	forumTopicId	title
587d78a8367417b2b2512ae4	0	https://scrimba.com/c/cDZpDUr	301062	使用无限的动画计数制作 CSS 心跳

Description

这也是一个用 animation-iteration-count 属性创造持续动画的例子，它基于前面关卡创建的心形。心跳动画的每一秒包含两个部分。heart 元素（包括 :before 和 :after）使用 transform 属性改变其大小，背景 div 使用 background 属性改变其颜色。

Instructions

给 back class和 heart class添加值为 infinite 的 animation-iteration-count 属性，使心脏持续跳动。heart:before 和 heart:after 选择器不需要添加动画属性。

Tests

tests:
  - text: '<code>heart</code> class 的 <code>animation-iteration-count</code> 属性应该赋值 infinte。'
    testString: assert($('.heart').css('animation-iteration-count') == 'infinite');
  - text: '<code>back</code> class 的 <code>animation-iteration-count</code> 属性应该赋值 infinite。'
    testString: assert($('.back').css('animation-iteration-count') == '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

2.6 KiB Raw Blame History