freeCodeCamp/curriculum/challenges/chinese-traditional/01-responsive-web-design/applied-visual-design/make-a-css-heartbeat-using-...

3.5 KiB

id title challengeType videoUrl forumTopicId dashedName
587d78a8367417b2b2512ae4 使用無限的動畫計數製作 CSS 心跳 0 https://scrimba.com/c/cDZpDUr 301062 make-a-css-heartbeat-using-an-infinite-animation-count

--description--

這也是一個用 animation-iteration-count 屬性創造持續動畫的例子,它基於我們在前面挑戰中創建的心形。

心跳動畫的每一秒包含兩個部分。 heart 元素(包括 :before:after)使用 transform 屬性改變其大小,背景 div 使用 background 屬性改變其顏色。

--instructions--

back class 和 the heart class 添加 animation-iteration-count 屬性,將屬性值設置爲 infinite,使心保持跳動。 heart:beforeheart:after 所選擇的元素則不需要添加動畫屬性。

--hints--

heart class 的 animation-iteration-count 的屬性值應爲 infinite

assert($('.heart').css('animation-iteration-count') == 'infinite');

back class 的 animation-iteration-count 的屬性值應爲 infinite

assert($('.back').css('animation-iteration-count') == 'infinite');

--seed--

--seed-contents--

<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>

--solutions--

<style>
  .back {
    position: fixed;
    padding: 0;
    margin: 0;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    animation-name: backdiv;
    animation-duration: 1s;
    animation-iteration-count: infinite;
  }

  .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;
    animation-iteration-count: infinite;
  }
  .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>