大家好！先上图看看本次案例的整体效果。

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**浪奔，浪流，万里涛涛江水永不休。如果在jq时代来实这个功能简直有些噩梦了，但是自从前端思想发展到现在的以MVVM为主流的大背景下，来实现一个这样繁杂的功能简直不能容易太多。下面就手把手带您一步步拨开这个案例的层层迷雾。**

实现步骤如下：

1. api构建部门和员工信息接口，vuex全局存放部门list和员工list数据信息。

api：

export default {
 getEmployeeList () {
  return {
   returncode: 0,
   message: '',
   result: [
    {
     id: 1,
     employeeName: '吴亦凡',
     departmentId: 44
    },
    {
     id: 2,
     employeeName: '鹿晗',
     departmentId: 45
    },
    {
     id: 3,
     employeeName: '孙红雷',
     departmentId: 44
    },
    {
     id: 4,
     employeeName: '周杰伦',
     departmentId: 45
    },
    {
     id: 5,
     employeeName: '张国荣',
     departmentId: 45
    },
    {
     id: 6,
     employeeName: '陈百强',
     departmentId: 45
    },
    {
     id: 7,
     employeeName: '谭咏麟',
     departmentId: 41
    },
    {
     id: 8,
     employeeName: '谷村新司',
     departmentId: 45
    },
    {
     id: 9,
     employeeName: '中岛美雪',
     departmentId: 46
    },
    {
     id: 10,
     employeeName: '周润发',
     departmentId: 47
    },
    {
     id: 14,
     employeeName: '周慧敏',
     departmentId: 58
    },
    {
     id: 13,
     employeeName: '张学友',
     departmentId: 58
    }
   ]
  }
 },
 getDepartmentList () {
  return {
   returncode: 0,
   message: '',
   result: [
    {
     id: 40,
     name: '研发一部',
     parentId: 37,
     sequence: 2
    },
    {
     id: 41,
     name: '研发二部',
     parentId: 37,
     sequence: 4
    },
    {
     id: 43,
     name: '市场',
     parentId: 0,
     sequence: 6
    },
    {
     id: 44,
     name: '销售',
     parentId: 0,
     sequence: 4
    },
    {
     id: 45,
     name: '财务',
     parentId: 0,
     sequence: 5
    },
    {
     id: 46,
     name: '研发三部',
     parentId: 37,
     sequence: 1
    },
    {
     id: 47,
     name: '研发四部',
     parentId: 37,
     sequence: 3
    },
    {
     id: 37,
     name: '研发',
     parentId: 0,
     sequence: 5
    },
    {
     id: 58,
     name: '研发一部',
     parentId: 57,
     sequence: 1
    },
    {
     id: 59,
     name: '测试',
     parentId: 0,
     sequence: 5
    },
    {
     id: 60,
     name: '测试一部',
     parentId: 59,
     sequence: 1
    },
    {
     id: 61,
     name: '测试二部',
     parentId: 59,
     sequence: 2
    },
    {
     id: 62,
     name: '研发二部',
     parentId: 57,
     sequence: 2
    }
   ]
  }
 }
}

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