Vue通过工具类实现展开收起功能

感谢https://segmentfault.com/q/1010000011359250大佬封装的工具类

/src/utils/collapseTransition.js
const elTransition = '0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out'
const Transition = {
  'before-enter'(el) {
    el.style.transition = elTransition
    if (!el.dataset) el.dataset = {}

    el.dataset.oldPaddingTop = el.style.paddingTop
    el.dataset.oldPaddingBottom = el.style.paddingBottom

    el.style.height = 0
    el.style.paddingTop = 0
    el.style.paddingBottom = 0
  },

  'enter'(el) {
    el.dataset.oldOverflow = el.style.overflow
    if (el.scrollHeight !== 0) {
      el.style.height = el.scrollHeight + 'px'
      el.style.paddingTop = el.dataset.oldPaddingTop
      el.style.paddingBottom = el.dataset.oldPaddingBottom
    } else {
      el.style.height = ''
      el.style.paddingTop = el.dataset.oldPaddingTop
      el.style.paddingBottom = el.dataset.oldPaddingBottom
    }

    el.style.overflow = 'hidden'
  },

  'after-enter'(el) {
    el.style.transition = ''
    el.style.height = ''
    el.style.overflow = el.dataset.oldOverflow
  },

  'before-leave'(el) {
    if (!el.dataset) el.dataset = {}
    el.dataset.oldPaddingTop = el.style.paddingTop
    el.dataset.oldPaddingBottom = el.style.paddingBottom
    el.dataset.oldOverflow = el.style.overflow

    el.style.height = el.scrollHeight + 'px'
    el.style.overflow = 'hidden'
  },

  'leave'(el) {
    if (el.scrollHeight !== 0) {
      el.style.transition = elTransition
      el.style.height = 0
      el.style.paddingTop = 0
      el.style.paddingBottom = 0
    }
  },

  'after-leave'(el) {
    el.style.transition = ''
    el.style.height = ''
    el.style.overflow = el.dataset.oldOverflow
    el.style.paddingTop = el.dataset.oldPaddingTop
    el.style.paddingBottom = el.dataset.oldPaddingBottom
  }
}

export default {
  name: 'collapseTransition',
  functional: true,
  render(h, { children }) {
    const data = {
      on: Transition
    }
    return h('transition', data, children)
  }
}

接着在需要展开收起功能的页面中引入工具类并注册