通过 background-size、background-position 和 animation-timing-function: steps 配合实现。

图片大小4520 * 89，共40个小图，单个小图大小113 * 89，分别对应：

• width: 113px; height: 89px;
• background-size: 4570px 89px;
• 动画结束状态 to { background-position: -4570px 0; }
• animation-timing-function: steps(40, end);

点击播放

<template>
  <div class="demo-AnimateFinger">
    <span>点击播放</span>
    <i class="finger"></i>
  </div>
</template>

<script>
export default {
  name: 'AnimateFinger',
}
</script>

<style lang="scss" scoped>
.demo-AnimateFinger {
  width: 240px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: #f2571e;
  color: #fff;
  font-size: 24px;
  font-weight: bold;
  letter-spacing: 4px;
  border-radius: 24px;
  margin: 40px auto 50px;
  cursor: pointer;
  .finger {
    width: 113px;
    height: 89px;
    background: url(//cdn.1024vip.cn/tech/images/202107/ec07fb0edb42d439473c9f974477b774.png) no-repeat;
    background-position: 0;
    background-size: 4570px 89px;
    animation: hand-bounce 1150ms steps(40, end) infinite;
    position: absolute;
    right: -25px;
    top: -6px;
  }
  @keyframes hand-bounce {
    to {
      background-position: -4570px 0;
    }
  }
}
</style>