JavaScript实现动态高度过渡的3种方式总结

 <div class="maxHeightTransition" ref="maxHeightTransition">
        Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Doloribus temporibus architecto enim,
        iure minima accusantium magni adipisci corrupti odio earum,
        necessitatibus aut delectus quibusdam porro distinctio
        sequi repellat at ullam?
 </div>

.maxHeightTransition {
  width: 100px;
  background-color: skyblue;
  transition: 0.5s;
  /*添加 500px*/
  max-hieght:500px
}

.maxHeightTransition {
 /*  
  * ....
  */
  overflow: hidden;
  max-height: 0px;
}

const maxHeightTransition = ref<HTMLDivElement | null>(null)
const isOpen = ref(false);

// 切换方法
const toggleHeight = () => {
  isOpen.value = !isOpen.value;
  maxHeightTransition.value.style.maxHeight = isOpen.value ? '0px' : '500px'
}

// 要展开的元素
let el = content.value as HTMLElement

 el.style.height = 'auto';
 let h = el.offsetHeight;
 el.style.height = '0px';
 requestAnimationFrame(() => {
    el.style.height = h + 'px'
 })

 <div class='box'>
      <div class="content">
        Lorem ipsum dolor sit amet consectetur adipisicing elit.
        Doloribus temporibus architecto enim,
        iure minima accusantium magni adipisci corrupti odio earum,
        necessitatibus aut delectus quibusdam porro distinctio
        sequi repellat at ullam?
      </div>
  </div>

.box {
  width: 100px;
  background-color: skyblue;
  color: white;
  
  display: grid;
  grid-template-rows: 0fr;
  transition: 0.5s;
}

.content {
  min-height: 0;
  overflow: hidden;
}

<div :class="['box', isOpen && 'open']">
    
</div>

const isOpen = ref(false);
const toggleHeight = () => {
  isOpen.value = !isOpen.value;
 }

.box:is(.open) {
  grid-template-rows: 1fr;
}