router.get("/get_depart", async (req, res) => {
  let data = await departModel.aggregate([
    {
      $lookup: {
        from: "depart",
        localField: "_id",
        foreignField: "did",
        as: "children",
        pipeline:[
          {
            $lookup: {
              from: "depart",
              localField: "_id",
              foreignField: "did",
              as: "children",
              pipeline:[
                {
                  $lookup: {
                    from: "depart",
                    localField: "_id",
                    foreignField: "did",
                    as: "children",
                  }
                }
              ]
            }
          }
        ]
      }
    },
    {$match:{level:1}}
  ])
  res.send({
    code:200,
    data
  })
})

router.get('/get_materialfy', async (req, res) => {
    try {
        cate = await materialClassfyModel.find().lean();
        let d = {}
        cate.forEach(i => {
            d[i._id] = i.mid;
        })
        /* 使用递归函数查询三级商品分类的信息 */
        function getCate(arr, fid = '') {
            return arr.filter(item => {
                if (('mid' in item ? item.mid.toString() : '') === fid.toString()) {
                    // item.fname = fid != '' ? d[fid] : '';
                    item.children = getCate(arr, item._id);
                    return true;
                }
            })
        }
        data = getCate(cate);
        res.send({
            code: 200,
            data
        })
    } catch (err) {
        console.log(err)
        return err
    }
})