清空对象数值

var data = {
    "user": {
        "Account": "admin",
        "Avatar": "1",
        "RealName": "管理员",
        "OrganizeName": "长庆油田公司第三采油厂",
        "OrganizeNames": [],
        "RoleNames": [{
                "Name": "系统管理员",
                "ID": 4
            },
            {
                "Name": "一般人员",
                "ID": 10
            }
        ],
        "TaskCount": 5,
        "TaskBLCount": 5,
        "BYTaskCount": 0,
        "BYTaskBLCount": 0
    },
    "items": [{
        "FFPID": "fcd77d54-5112-467b-8333-22528304578b",
        "OperateUserID": "752896b3-4cc0-48aa-a47e-6e933d6cd354",
        "OrganizeName": "人事(组织)科",
        "WFID": "7f96725a-861c-4b2d-98ca-e41ea4fe9f6a",
        "EntityId": null,
        "State": 2,
        "TBeginDate": "/Date(1600272000000)/",
        "CreateDate": "/Date(1600313974110)/",
        "ReportName": "提质增效周报表（专项小组）",
        "ModifyUserName": "管理员",
        "OperateDate": null,
        "Enabled": 1,
        "DeleteMark": 0,
        "ModifyDate": "/Date(1600314403707)/",
        "Sign": 0,
        "IsOpen": 1,
        "EntityName": null,
        "ProcessId": "33b3e839-6bb0-406f-bb0f-994f1209bbef",
        "BeginDate": "/Date(1600313974110)/",
        "EndDate": null,
        "ReportId": null,
        "IsHandle": 0,
        "CreateUserName": "管理员",
        "ID": "4714022b-54d8-4557-a35a-a1e588c654a2",
        "TEndDate": "/Date(1600444800000)/",
        "CreateUserId": "752896b3-4cc0-48aa-a47e-6e933d6cd354",
        "OrganizeCode": "0303",
        "ProcessName": "审核",
        "Title": "【2020年09月第3周】提质增效周报表（专项小组）",
        "TaskID": "04fbe4a8-db7c-4f30-ba88-aadf3c28b565"
    }]
}

function deepfn(obj) {
    for (var k in obj) {
        var val = obj[k]
        if (val == undefined || val == undefined) {
            continue
        } else if (typeof val === 'string') {
            obj[k] = ''
        } else if (Object.prototype.toString.call(val) === '[object Array]') {
            obj[k] = []
        } else if (val instanceof Date) {
            obj[k] = ''
        } else if (typeof val == 'object') {
            deepfn(obj[k])
        } else if (typeof val == 'number') {
            obj[k] = 0
        } else if (typeof val == 'boolean') {
            obj[k] = true
        }
    }
}