JavaScript树型数据与一维数组相互转换方式

/**
 * @description 一维数组转树形数据
 * */
export const arrToTree = (data = [], conf = {}) => (((data, { id = 'id', parentId = 'parentId', children = 'children' }) => {
  let result = []
  if (!Array.isArray(data)) {
    return result
  }
  data = commonMerge({}, { list: data }).list
  data.forEach(item => {
    delete item[children]
  })
  let map = {}
  data.forEach(item => {
    map[item[id]] = item // id为键，原数据每一项为值的map对象
  })
  data.forEach(item => {
    let parent = map[item[parentId]] // item的parentId若与map对象的键相同，则item为父级节点
    if (parent) {
      (parent[children] || (parent[children] = [])).push(item)
    } else {
      result.push(item)
    }
  })
  return result
})(data, conf));