map 、new Set、[...] 、 filter用法

 var data = [    
        {
            "StepName":"送拟稿部门初审",
            "Label":"送拟稿部门初审",
            "NeedUser":true,
            "AllowSelect":true,
            "AllowFree":false,
            "OnlySingleSel":false,
            "AutoSelectAll":false,
            "Visible":false,
            "OrderIndex":0,
            "WorkFlowXml":"本部门初审",
            "Users":[
                {
                    "ID":"06f0d6c4-d42a-46d6-82f3-4080c889499d",
                    "Name":"朱晓明",
                    "OrgId":"8d9ce4c0-8d11-4027-af9d-0fe37fe540d1",
                    "OrgName":"信息管理中心IT建设与应用部",
                    "Rank":"999",
                    "RoleDeptID":null,
                    "RoleDeptName":null,
                    "ParallelKey":"",
                    "ParallelLabel":""
                },
                {
                    "ID":"17372b4c-d922-4507-a662-756fbd4fabf4",
                    "Name":"大宋",
                    "OrgId":"8d9ce4c0-8d11-4027-af9d-0fe37fe540d1",
                    "OrgName":"信息管理中心",
                    "Rank":"999",
                    "RoleDeptID":null,
                    "RoleDeptName":null,
                    "ParallelKey":"",
                    "ParallelLabel":""
                },
                {
                    "ID":"1adc4150-1772-4df9-849b-5c28c5103d37",
                    "Name":"罗志祥",
                    "OrgId":"8d9ce4c0-8d11-4027-af9d-0fe37fe540d1",
                    "OrgName":"集团公司",
                    "Rank":"999",
                    "RoleDeptID":null,
                    "RoleDeptName":null,
                    "ParallelKey":"",
                    "ParallelLabel":""
                },
            ]
        },
        {
            "StepName":"拟稿本部门部门经理/部门领导审稿",
            "Label":"拟稿本部门部门经理/部门领导审稿",
            "NeedUser":true,
            "AllowSelect":true,
            "AllowFree":false,
            "OnlySingleSel":false,
            "AutoSelectAll":false,
            "Visible":false,
            "OrderIndex":0,
            "WorkFlowXml":"本部门部门经理审稿",
            "Users":[
                {
                    "ID":"bd15c9ff-acee-474b-91d3-e379b5a01910",
                    "Name":"杨幂",
                    "OrgId":"8d9ce4c0-8d11-4027-af9d-0fe37fe540d1",
                    "OrgName":"信息管理中心IT建设与应用部",
                    "Rank":"1",
                    "RoleDeptID":null,
                    "RoleDeptName":null,
                    "ParallelKey":"",
                    "ParallelLabel":""
                },
                {
                    "ID":"b1c6f539-85fa-4008-ad47-10972d5bfc09",
                    "Name":"娜扎",
                    "OrgId":"8d9ce4c0-8d11-4027-af9d-0fe37fe540d1",
                    "OrgName":"信息管理中心IT建设与应用部",
                    "Rank":"2",
                    "RoleDeptID":null,
                    "RoleDeptName":null,
                    "ParallelKey":"",
                    "ParallelLabel":""
                },
                {
                    "ID":"0f7c2a11-fc32-46c7-b618-cced5ccb170e",
                    "Name":"迪丽热巴",
                    "OrgId":"8d9ce4c0-8d11-4027-af9d-0fe37fe540d1",
                    "OrgName":"党群综合部",
                    "Rank":"3",
                    "RoleDeptID":null,
                    "RoleDeptName":null,
                    "ParallelKey":"",
                    "ParallelLabel":""
                }
            ]
        }
    ];   
        data.forEach(i => {  //把两层数据 拆分三层数据   第为二层为部门层
            var orgNameLi = i.Users
            console.log('*******', orgNameLi);
            var orgNameList = orgNameLi.map(item=>item.OrgName)//按部门分类
            console.log('jjj',orgNameList)
            let tmpList = new Set(orgNameList)   //去重
            console.log('kkk',tmpList)
            let arrList = [...tmpList]  //转换成数组
            console.log('lll',arrList)
            if(arrList.length){
                for(let orgName of arrList){
                    let orgPeople = orgNameLi.filter(item=>item.OrgName == orgName) //数据筛选 部门相同 则给到orgPeople
                    console.log('jshs',orgPeople)
                }
            }
        });           

结果为：