data_governance/src/views/homecomponents/EquipmentAnalysis/listToTree.js

//将后端返回的list数据转化为树结构
export const listToTree = (list) => {
  var arr = []
  let items = {}
  var idsStr = ''
  // 获取每个节点的直属子节点（是直属，不是所有子节点）
  for (let i = 0; i < list.length; i++) {
      let key = list[i].parentId
      if (items[key]) {
          items[key].push(list[i])
      } else {
          items[key] = []
          items[key].push(list[i])
      }
      idsStr += idsStr === '' ? list[i].id : ',' + list[i].id
  }
  for (var key in items) {
      if (idsStr.indexOf(key) === -1) {//找到最大的父节点key
          arr=formatTree(items, key)
      }
  }
  delete arr[0].parentId
  return arr
}
function formatTree(items, parentId) {
  let result = []
  if (!items[parentId]) {
      return result
  }
  for (let t of items[parentId]) {
      t.children = formatTree(items, t.id)//递归获取children
      result.push(t)
  }
  return result
}