图标引入

<img class="icon" src="heart.svg" alt="" srcset="">

CSS代码

<style>
  .icon {
    animation:
      bpm 1s linear,
      pulse 0.75s 1s linear infinite;
  }

  @keyframes pulse {
    from,
    75%,
    to {
      transform: scale(1);
    }

    25% {
      transform: scale(0.9);
    }

    50% {
      transform: scale(1.2);
    }
  }

  @keyframes bpm {
    from {
      transform: scale(0);
    }

    37.5% {
      transform: scale(1.2);
    }

    75%,
    to {
      transform: scale(1);
    }
  }
</style>