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document.getElementById('clicky').addEventListener('click', () => {
  const element=document.querySelector('.highlight');
  element.setAttribute('data-remove-class', 'highlight');
  element.innerHTML='將在動畫結束時移除類';
});

document.querySelector('.highlight').addEventListener('animationend', (e) => {
  const removeClass = e.target.getAttribute('data-remove-class');
  if (removeClass == 'highlight') {
    e.target.classList.remove(removeClass);
    e.target.removeAttribute('data-remove-class');
    e.target.innerHTML='類已移除！';
  }
});

.highlight {
  animation-name: highlight;
  animation-duration: 3s;
}

@keyframes highlight {
  0% {
    background-color: yellow;
  }
  99.99% {
    background-color: orange;
  }
}

<div class='highlight'>正在動畫中！</div>
<button id='clicky'>移除類</button>