<body>
<div class=‘wrapper‘>
<button class=‘like-btn‘>
<span class=‘like-text‘>点赞</span>
<span>??</span>
</button>
</div>
</body>
<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>
原文：https://www.cnblogs.com/qjuly/p/13380988.html