var jsonArray = {

'data':{
    "List": [{
                "authorityId": 1,
                "authorityName": "数据分析",
                "grade": "1001",
                "fatherId": "0"
            },
            {
                "authorityId": 2,
                "authorityName": "商务政策",
                "grade": "1002",
                "fatherId": "0"
            },
            {
                "authorityId": 3,
                "authorityName": "市场动态",
                "grade": "1003",
                "fatherId": "0"
            },
            {
                "authorityId": 4,
                "authorityName": "消息中心",
                "grade": "1004",
                "fatherId": "0"
            },
            {
                "authorityId": 5,
                "authorityName": "个人中心",
                "grade": "1005",
                "fatherId": "0"
            },
            {
                "authorityId": 6,
                "authorityName": "价格查询分析",
                "grade": "2101",
                "fatherId": "1001"
            },
            {
                "authorityId": 7,
                "authorityName": "销量查询分析",
                "grade": "2102",
                "fatherId": "1001"
            },
            {
                "authorityId": 8,
                "authorityName": "装备查询分析",
                "grade": "2103",
                "fatherId": "1001",
            },
            {
                "authorityId": 9,
                "authorityName": "政策数据分析",
                "grade": "2201",
                "fatherId": "1002"
            },
            {
                "authorityId": 10,
                "authorityName": "政策原件下载",
                "grade": "2202",
                "fatherId": "1002"
            },
            {
                "authorityId": 11,
                "authorityName": "新车上市",
                "grade": "2301",
                "fatherId": "1003"
            },
            {
                "authorityId": 12,
                "authorityName": "营销活动",
                "grade": "2302",
                "fatherId": "1003"
            }
        ]
}

}
期望拼成下列树形数据格式(用jq或是es6实现)
对应关系：父的grade=子的fatherid
data:[

{
      label: '一级 1',
      children: [{
        label: '二级 1-1',
        children: [{
          label: '三级 1-1-1'
        }]
      }]
    }, {
      label: '一级 2',
      children: [{
        label: '二级 2-1',
        children: [{
          label: '三级 2-1-1'
        }]
      }, {
        label: '二级 2-2',
        children: [{
          label: '三级 2-2-1'
        }]
      }]
    }

]