<div class='wrapper'>
  <button class='like-btn'>
    <span class='like-text'>点赞</span>
    <span>👍</span>
  </button>
</div>

<script>
const button = document.querySelector('.like-btn')
const buttonText = button.querySelector('.like-text')
let isLiked = false
button.addEventListener('click', () => {
  isLiked = !isLiked
  if (isLiked) {
    buttonText.innerHTML = '取消'
  } else {
    buttonText.innerHTML = '点赞'
  }
}, false)
</script>