子衿沉夜
链接Descendant elements do not generate any boxes either; the element and its content are removed from the formatting structure entirely. Please note that a display of 'none' does not create an invisible box; it creates no box at all.我觉得是这个原因吧。设置为display:none的元素及内容不会被创建。所以每次切换的时候就是重新创建了一次，导致样式什么的会重新生效。试试这个吧，动画执行完把样式删了。或者在别的什么时机把动画样式删了。el.addEventListener('animationend', function () {
el.classList.remove('zoom')
})