text: 'use strict'
  import Vue from 'vue'
  export default function treeToArray(data, expandAll, parent = null, level = null) {
    let tmp = []
    Array.from(data).forEach(function (record) {
      if (record._expanded === undefined) {
        Vue.set(record, '_expanded', expandAll)
      }
      let _level = 1
      if (level !== undefined && level !== null) {
        _level = level + 1
      }
      Vue.set(record, '_level', _level)
      // 如果有父元素
      if (parent) {
        Vue.set(record, 'parent', parent)
      }
      tmp.push(record)
      if (record.children && record.children.length > 0) {
        const children = treeToArray(record.children, expandAll, record, _level)
        tmp = tmp.concat(children)
      }
    })
    return tmp
  }