基于Vue+Nodejs实现宿舍管理系统


作者主页：编程指南针

 简介：Java领域优质创作者、CSDN博客专家  Java项目、简历模板、学习资料、面试题库、技术互助

文末获取源码

项目编号：BS-QD-002

主要需求：

学生信息录入、修改、删除、查询
宿舍管理评分
学生早起率、懒床率
学生宿舍打扫频率
学生晚归情况
楼层管理

考虑到实用性，该系统需要拆分为两大子系统，一个是学生端系统，一个是后台管理端系统。学生端系统主要提供给学生使用，负责一些宿舍记录及个人信息记录的基本操作；后台管理模块则是主要负责对所有学生信息的整理，提供宿舍管理、楼层管理、数据查看等权限，提供给宿舍管理员使用的。

学生登陆

学生系统拥有以下功能：

创建账户
分配宿舍
填写个人信息
修改个人信息
起床打卡（用于统计懒床率）
归宿登记（用于统计晚归情况）
打扫记录（用于统计宿舍打扫频率）
查看宿日常数据

管理员登陆

管理系统拥有以下功能：

楼层管理
宿舍评价
宿舍信息管理
学生信息查看
保洁人员管理
统计学生早起率
统计学生宿舍打扫频率
统计学生晚归

超级管理员在享有上述管理员同等权限的同时额外拥有如下功能：

创建管理员
创建宿舍楼
为宿舍楼分配管理员
为宿舍楼分配保洁人员

前端：

Vue 作为基础框架
vue-router 控制路由（hash 模式）
vuex 状态管理
axios 接入数据
Vue-element-admin 作为基础框架

后台（Nodejs）：

Koa 作为基础框架
koa-router —— 服务端路由控制
koa-static —— 读取静态文件
koa-jwt —— JWT 登录校验
koa-body —— http body 数据处理
koa-compress —— Gzip 压缩
koa-cors —— CORS 解决跨域问题
sequelize —— ORM

数据库：

MySQL

数据库设计一览：

下面展示一下系统的部分功能：

仪表盘概揽：选择不同的宿舍楼查看相关信息

管理员管理：

宿舍楼管理

楼层管理

宿舍信息

宿舍入住学生信息

查看学生起床记录

查看学生归宿信息

查看学生宿舍打扫信息

查看个人信息

学生注册

注册后登陆系统

入住宿舍

起床打卡

归宿记录

打扫记录

后端工程：

前端工程

部门核心代码：

const { Building } = require("../model")

module.exports = {
  getStudents: async function(buildingId) {
    const FloorController = require("./floor_controller")
    let users = []
    const building = await Building.findOne({ where: { id: buildingId } })
    const floors = await building.getFloors()
    for (let floor of floors) {
      const floorId = floor.id
      users = [...users, ...(await FloorController.getStudents(floorId))]
    }
    return users
  },
  delBuilding: async function(id) {
    const { setStudentRoomNull } = require("./user_controller")
    const students = await this.getStudents(id)
    students.forEach(student => {
      setStudentRoomNull(student.id)
    })
    return await Building.destroy({ where: { id } })
  }
}

const _ = require("lodash")
const { User } = require("../model")

module.exports = {
  async getEvaluatesInfo(evaluates) {
    const cpEvaluates = _.cloneDeep(evaluates)
    for (let evaluate of cpEvaluates) {
      const creator = await evaluate.getUser()
      evaluate.dataValues.userName = creator.name
    }
    return cpEvaluates
  }
}

const { Floor } = require("../model")

module.exports = {
  getStudents: async function(floorId) {
    const { getStudentInfo } = require("./user_controller")
    let users = []
    const floor = await Floor.findOne({ where: { id: floorId } })
    const rooms = await floor.getRooms()
    for (let room of rooms) {
      const roomUsers = await room.getUsers()
      for (let user of roomUsers) {
        users.push(await getStudentInfo(user.id))
      }
    }
    return users
  }
}

module.exports = {
  UserController: require("./user_controller"),
  RoomController: require("./room_controller"),
  FloorController: require("./floor_controller"),
  BuildingController: require("./building_controller"),
  EvaluateController: require("./evaluate_controller"),
  RecordController: require("./record_controller")
}

const {
  User,
  GetupRecord,
  CleanRecord,
  BackRecord,
  Room,
  Floor,
  Building
} = require("../model")
const { Op } = require("sequelize")
const moment = require("moment")
const _ = require("lodash")

const getupEarlyPoint = 8
const backEarlyPoint = 22

module.exports = {
  // getup 相关
  async addGetupRecord(userId) {
    const user = await User.findOne({ where: { id: userId } })
    const todyRecord = await GetupRecord.findOne({
      where: {
        userId: user.id,
        roomId: user.roomId,
        createdAt: {
          [Op.gt]: moment()
            .startOf("day")
            .toDate(),
          [Op.lt]: moment()
            .endOf("day")
            .toDate()
        }
      }
    })
    if (todyRecord) {
      throw new Error("当天已经有记录，记录失败!")
    }
    return await GetupRecord.create({ userId: user.id, roomId: user.roomId })
  },
  async getUserGetupRecords(userId, days, pure = false) {
    days = parseInt(days)
    const user = await User.findOne({ where: { id: userId } })
    const roomId = user.roomId
    const room = await Room.findOne({ where: { id: roomId } })
    // 获取最近 days 天的记录
    const startTime = moment()
      .subtract(days - 1 /* -1 代表查询天数包括今天 */, "days")
      .startOf("day")
      .toDate()
    const allRecords = []
    for (let i = 0; i < days; i++) {
      const todayStart = moment(startTime)
        .add(i, "days")
        .toDate()
      const todayEnd = moment(todayStart)
        .endOf("day")
        .toDate()
      let record = await GetupRecord.findOne({
        where: {
          userId,
          roomId,
          createdAt: {
            [Op.gt]: todayStart,
            [Op.lt]: todayEnd
          }
        },
        attributes: { exclude: ["updatedAt", "deletedAt"] }
      })
      if (record) {
        // 如果当天有记录就推入结果
        record = record.toJSON()
        record.time = moment(record.createdAt).format("HH:mm")
      } else if (!record && !pure) {
        // 如果获取的是全部数据且当前天无数据
        // 就建立一条空记录
        record = GetupRecord.build({
          id: "fake" + i,
          roomId,
          userId,
          createdAt: todayStart
        }).toJSON()
        record.time = null
      } else {
        continue
      }
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      record.userName = user.name
      record.roomNumber = room.number
      allRecords.push(record)
    }
    return allRecords.reverse()
  },
  async getRoomGetupRecords(roomId, days, pure = false) {
    days = parseInt(days)
    const room = await Room.findOne({ where: { id: roomId } })
    const users = await room.getUsers()
    const records = {}
    for (let user of users) {
      records[user.name] = await this.getUserGetupRecords(user.id, days, pure)
    }
    return records
  },
  async getGetupRecordLineCharData(roomId) {
    const room = await Room.findOne({ where: { id: roomId } })
    const users = await room.getUsers()
    const data = { columns: ["周期"], rows: [] }
    const dataCount = 5 // 获取的记录条数
    const dataStep = 7 // 每条记录相隔的条数
    // 初始化记录值
    for (let i = 0; i < dataCount; i++) {
      data.rows.push({ 周期: `最近${(i + 1) * dataStep}天` })
    }
    // 遍历当前宿舍的用户
    for (let user of users) {
      data.columns.push(user.name)
      for (let i = 0; i < dataCount; i++) {
        const days = (i + 1) * dataStep
        // 获取某学生最近 days 天的早起记录
        const records = await this.getUserGetupRecords(user.id, days, true)
        let earlyTimes = 0
        records.forEach(record => {
          // 统计这些记录中有几天是早起的
          const timeHour = parseInt(moment(record.createdAt).format("HH"))
          if (timeHour < getupEarlyPoint) {
            earlyTimes++
          }
        })
        // 计算早起率
        const probability = (earlyTimes / days).toFixed(4)
        data.rows[i][user.name] = probability
      }
    }
    return data
  },
  async getGetupTableData({
    current,
    step,
    buildingId,
    floorId,
    roomId,
    userId,
    startTime,
    endTime
  }) {
    // 初始化时间
    startTime = startTime
      ? moment(startTime)
          .startOf("day")
          .toDate()
      : moment(0).toDate()
    endTime = endTime
      ? moment(endTime)
          .endOf("day")
          .toDate()
      : moment()
          .endOf("day")
          .toDate()
    console.log("endTime: ", endTime)
    // 开始分情况获取数据
    let result
    if (userId) {
      result = await GetupRecord.findAndCountAll({
        where: {
          userId: userId,
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (roomId) {
      result = await GetupRecord.findAndCountAll({
        where: {
          roomId: roomId,
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (floorId) {
      result = await GetupRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        include: [
          {
            model: Room,
            where: { floorId }
          }
        ],
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (buildingId) {
      result = await GetupRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        include: [
          {
            model: Room,
            where: { buildingId }
          }
        ],
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else {
      result = await GetupRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    }
    const getStudentInfo = require("./user_controller").getStudentInfo
    let rows = []
    for (let record of result.rows) {
      record = record.toJSON()
      delete record.room
      const userInfo = await getStudentInfo(record.userId)
      record = Object.assign(userInfo, record)
      record.time = moment(record.createdAt).format("HH:mm")
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      if (parseInt(moment(record.createdAt).format("HH")) < getupEarlyPoint) {
        record.early = true
      } else {
        record.early = false
      }
      rows.push(record)
    }
    result.rows = rows
    return result
  },

  // back 相关
  async addBackRecord(userId) {
    const user = await User.findOne({ where: { id: userId } })
    const todyRecord = await BackRecord.findOne({
      where: {
        userId: user.id,
        roomId: user.roomId,
        createdAt: {
          [Op.gt]: moment()
            .startOf("day")
            .toDate(),
          [Op.lt]: moment()
            .endOf("day")
            .toDate()
        }
      }
    })
    if (todyRecord) {
      throw new Error("当天已经有记录，记录失败!")
    }
    return await BackRecord.create({ userId: user.id, roomId: user.roomId })
  },
  async getUserBackRecords(userId, days, pure = false) {
    days = parseInt(days)
    const user = await User.findOne({ where: { id: userId } })
    const roomId = user.roomId
    const room = await Room.findOne({ where: { id: roomId } })
    // 获取最近 days 天的记录
    const startTime = moment()
      .subtract(days - 1 /* -1 代表查询天数包括今天 */, "days")
      .startOf("day")
      .toDate()
    const allRecords = []
    for (let i = 0; i < days; i++) {
      const todayStart = moment(startTime)
        .add(i, "days")
        .toDate()
      const todayEnd = moment(todayStart)
        .endOf("day")
        .toDate()
      let record = await BackRecord.findOne({
        where: {
          userId,
          roomId,
          createdAt: {
            [Op.gt]: todayStart,
            [Op.lt]: todayEnd
          }
        },
        attributes: { exclude: ["updatedAt", "deletedAt"] }
      })
      if (record) {
        // 如果当天有记录就推入结果
        record = record.toJSON()
        record.time = moment(record.createdAt).format("HH:mm")
      } else if (!record && !pure) {
        // 如果获取的是全部数据且当前天无数据
        // 就建立一条空记录
        record = BackRecord.build({
          id: "fake" + i,
          roomId,
          userId,
          createdAt: todayStart
        }).toJSON()
        record.time = null
      } else {
        continue
      }
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      record.userName = user.name
      record.roomNumber = room.number
      allRecords.push(record)
    }
    return allRecords.reverse()
  },
  async getRoomBackRecords(roomId, days, pure = false) {
    days = parseInt(days)
    const room = await Room.findOne({ where: { id: roomId } })
    const users = await room.getUsers()
    const records = {}
    for (let user of users) {
      records[user.name] = await this.getUserBackRecords(user.id, days, pure)
    }
    return records
  },
  async getBackRecordLineCharData(roomId) {
    const room = await Room.findOne({ where: { id: roomId } })
    const users = await room.getUsers()
    const data = { columns: ["周期"], rows: [] }
    const dataCount = 5 // 获取的记录条数
    const dataStep = 7 // 每条记录相隔的条数
    // 初始化记录值
    for (let i = 0; i < dataCount; i++) {
      data.rows.push({ 周期: `最近${(i + 1) * dataStep}天` })
    }
    // 遍历当前宿舍的用户
    for (let user of users) {
      data.columns.push(user.name)
      for (let i = 0; i < dataCount; i++) {
        const days = (i + 1) * dataStep
        // 获取某学生最近 days 天的归宿记录
        const records = await this.getUserBackRecords(user.id, days, true)
        let earlyTimes = 0
        records.forEach(record => {
          // 统计这些记录中有几天是早归的
          const timeHour = parseInt(moment(record.createdAt).format("HH"))
          if (timeHour < backEarlyPoint) {
            earlyTimes++
          }
        })
        // 计算早起率
        const probability = (earlyTimes / days).toFixed(4)
        data.rows[i][user.name] = probability
      }
    }
    return data
  },
  async getBackTableData({
    current,
    step,
    buildingId,
    floorId,
    roomId,
    userId,
    startTime,
    endTime
  }) {
    // 初始化时间
    startTime = startTime
      ? moment(startTime)
          .startOf("day")
          .toDate()
      : moment(0).toDate()
    endTime = endTime
      ? moment(endTime)
          .endOf("day")
          .toDate()
      : moment()
          .endOf("day")
          .toDate()
    // 开始分情况获取数据
    let result
    if (userId) {
      result = await BackRecord.findAndCountAll({
        where: {
          userId: userId,
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (roomId) {
      result = await BackRecord.findAndCountAll({
        where: {
          roomId: roomId,
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (floorId) {
      result = await BackRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        include: [
          {
            model: Room,
            where: { floorId }
          }
        ],
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (buildingId) {
      result = await BackRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        include: [
          {
            model: Room,
            where: { buildingId }
          }
        ],
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else {
      result = await BackRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    }
    const getStudentInfo = require("./user_controller").getStudentInfo
    let rows = []
    for (let record of result.rows) {
      record = record.toJSON()
      delete record.room
      const userInfo = await getStudentInfo(record.userId)
      record = Object.assign(userInfo, record)
      record.time = moment(record.createdAt).format("HH:mm")
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      if (parseInt(moment(record.createdAt).format("HH")) < backEarlyPoint) {
        record.early = true
      } else {
        record.early = false
      }
      rows.push(record)
    }
    result.rows = rows
    return result
  },

  // clean 相关
  async addCleanRecord(userId) {
    const user = await User.findOne({ where: { id: userId } })
    const todyRecord = await CleanRecord.findOne({
      where: {
        roomId: user.roomId,
        createdAt: {
          [Op.gt]: moment()
            .startOf("day")
            .toDate(),
          [Op.lt]: moment()
            .endOf("day")
            .toDate()
        }
      }
    })
    if (todyRecord) {
      throw new Error("当天已经有清扫记录，记录失败")
    }
    return await CleanRecord.create({
      userId: user.id,
      roomId: user.roomId
    })
  },
  async getUserCleanRecords(userId, days) {
    // 获取打扫记录不会自动补全每一天的信息
    days = parseInt(days)
    const user = await User.findOne({ where: { id: userId } })
    const roomId = user.roomId
    const room = await Room.findOne({ where: { id: roomId } })
    // 获取最近 days 天的记录
    const startTime = moment()
      .subtract(days - 1 /* -1 代表查询天数包括今天 */, "days")
      .startOf("day")
      .toDate()
    const todayEnd = moment()
      .endOf("day")
      .toDate()
    const records = await CleanRecord.findAll({
      where: {
        userId,
        roomId,
        createdAt: {
          [Op.gt]: startTime,
          [Op.lt]: todayEnd
        }
      },
      attributes: { exclude: ["updatedAt", "deletedAt"] },
      order: [["createdAt", "DESC"]]
    })
    const allRecords = []
    records.forEach(record => {
      record = record.toJSON()
      record.time = moment(record.createdAt).format("HH:mm")
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      record.userName = user.name
      record.roomNumber = room.number
      allRecords.push(record)
    })
    return allRecords
  },
  async getRoomCleanRecords(roomId, days) {
    const room = await Room.findOne({ where: { id: roomId } })
    const startTime = moment()
      .subtract(days - 1 /* -1 代表查询天数包括今天 */, "days")
      .startOf("day")
      .toDate()
    const todayEnd = moment()
      .endOf("day")
      .toDate()
    const records = await room.getCleanRecords({
      where: {
        createdAt: {
          [Op.gt]: startTime,
          [Op.lt]: todayEnd
        }
      },
      attributes: { exclude: ["updatedAt", "deletedAt"] },
      order: [["createdAt", "DESC"]]
    })
    const allRecords = []
    for (let record of records) {
      const user = await record.getUser()
      record = record.toJSON()
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      record.time = moment(record.createdAt).format("HH:mm")
      record.userName = user.name
      record.roomNumber = room.number
      allRecords.push(record)
    }
    return allRecords
  },
  async getCleanTableData({
    current,
    step,
    buildingId,
    floorId,
    roomId,
    userId,
    startTime,
    endTime
  }) {
    // 初始化时间
    startTime = startTime
      ? moment(startTime)
          .startOf("day")
          .toDate()
      : moment(0).toDate()
    endTime = endTime
      ? moment(endTime)
          .endOf("day")
          .toDate()
      : moment()
          .endOf("day")
          .toDate()
    // 开始分情况获取数据
    let result
    if (userId) {
      result = await CleanRecord.findAndCountAll({
        where: {
          userId: userId,
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (roomId) {
      result = await CleanRecord.findAndCountAll({
        where: {
          roomId: roomId,
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (floorId) {
      result = await CleanRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        include: [
          {
            model: Room,
            where: { floorId }
          }
        ],
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else if (buildingId) {
      result = await CleanRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        include: [
          {
            model: Room,
            where: { buildingId }
          }
        ],
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    } else {
      result = await CleanRecord.findAndCountAll({
        where: {
          createdAt: {
            [Op.gt]: startTime,
            [Op.lt]: endTime
          }
        },
        limit: step,
        offset: step * (current - 1),
        order: [["createdAt", "DESC"]]
      })
    }
    const getStudentInfo = require("./user_controller").getStudentInfo
    let rows = []
    for (let record of result.rows) {
      record = record.toJSON()
      delete record.room
      const userInfo = await getStudentInfo(record.userId)
      record = Object.assign(userInfo, record)
      record.time = moment(record.createdAt).format("HH:mm")
      record.date = moment(record.createdAt).format("YYYY-MM-DD")
      record.early = null
      rows.push(record)
    }
    result.rows = rows
    return result
  },

  // 通用
  async getUserProbability(type, userId) {
    const user = await User.findById(userId)
    const startTime = user.checkTime
    let records = []
    let allRecords = []
    switch (type) {
      case "getup":
        allRecords = await user.getGetupRecords({
          where: {
            createdAt: { [Op.gt]: startTime }
          }
        })
        allRecords.forEach(record => {
          let hour = parseInt(moment(record.createdAt).format("HH"))
          if (hour < getupEarlyPoint) {
            records.push(record)
          }
        })
        break
      case "back":
        allRecords = await user.getBackRecords({
          where: {
            createdAt: { [Op.gt]: startTime }
          }
        })
        allRecords.forEach(record => {
          let hour = parseInt(moment(record.createdAt).format("HH"))
          if (hour < backEarlyPoint) {
            records.push(record)
          }
        })
        break
      case "clean":
        records = await user.getCleanRecords({
          where: {
            createdAt: { [Op.gt]: startTime }
          }
        })
        break
      default:
        throw new Error("参数传入错误")
    }
    // 计算从入住到现在有几天了
    const days = Math.abs(moment(startTime).diff(moment(), "days"))
    return (records.length / (days + 1)).toFixed(4)
  }
}

const { User } = require("../model")
const _ = require("lodash")
const RecordController = require("./record_controller")

module.exports = {
  /**
   * 获取学生用户的完整信息
   * @param {Number} userId
   */
  async getStudentInfo(userId) {
    const student = await User.findOne({
      where: { id: userId },
      attributes: { exclude: ["password", "deletedAt"] }
    })
    const room = await student.getRoom()
    const floor = await room.getFloor()
    const building = await floor.getBuilding()
    const getupProb = await RecordController.getUserProbability("getup", userId)
    const backProb = await RecordController.getUserProbability("back", userId)
    const cleanProb = await RecordController.getUserProbability("clean", userId)
    const info = Object.assign(student.dataValues, {
      roomNumber: room.number,
      floorId: floor.id,
      floorLayer: floor.layer,
      buildingId: building.id,
      buildingName: building.name,
      getupProb,
      backProb,
      cleanProb
    })
    return info
  },

  /**
   * 获取学生用户们的完整信息
   * @param {Array} users
   */
  async getStudentsInfo(users) {
    const cloneUsers = _.cloneDeep(users)
    for (let user of cloneUsers) {
      delete user.dataValues.password
      delete user.dataValues.deletedAt
      const room = await user.getRoom()
      const floor = await room.getFloor()
      const building = await floor.getBuilding()
      Object.assign(user.dataValues, {
        roomNumber: room.number,
        floorId: floor.id,
        floorLayer: floor.layer,
        buildingId: building.id,
        buildingName: building.name
      })
    }
    return cloneUsers
  },

  async setStudentRoomNull(id) {
    const student = await User.findOne({ where: { id, role: "student" } })
    const result = await student.update({ roomId: null })
    return result
  }
}