原数据格式

let obj =[
        {1:'20190805',2:'1',3:'success'},
        {1:'20191120',2:'1.1',3:'success'},
        {1:'20190212',2:'1.1.1',3:'success'},
        {1:'20190212',2:'1.1.2',3:'success'},
        {1:'20190212',2:'1.1.3',3:'success'},
        {1:'20190212',2:'1.2',3:'success'},
        {1:'20190212',2:'1.2.1',3:'success'},
        {1:'20190212',2:'2',3:'success'},
        {1:'20190212',2:'2.1',3:'success'},
        {1:'20190212',2:'2.2.1',3:'success'},
        {1:'20190212',2:'2.2',3:'success'},
        {1:'20190212',2:'2.3',3:'success'},
        {1:'20190212',2:'2.3.1',3:'success'},
        ...
        ]

最后想要下面这种结果格式，请问该怎么实现呢

let data = [
        {1: '20190805', 2: '1', 3: 'success', children: [
            {1: '20191120', 2: '1.1', 3: 'success', children: [
                {1: '20190212', 2: '1.1.1', 3: 'success'},
                {1: '20190212', 2: '1.1.2', 3: 'success'},
                {1: '20190212', 2: '1.1.3', 3: 'success'},
            ]}, {1: '20191120', 2: '1.2', 3: 'success', children: [
                    {1: '20190212', 2: '1.2.1', 3: 'success'},
                ]
            }]
        },
        {1: '20190212', 2: '2', 3: 'success', children: [
            {1: '20190212', 2: '2.1', 3: 'success', children: [
                {1: '20190212', 2: '2.2.1', 3: 'success'},
            ]},
            {1: '20190212', 2: '2.2', 3: 'success'},
            {1: '20190212', 2: '2.3', 3: 'success', children: [
                {1: '20190212', 2: '2.3.1', 3: 'success'}]
            }]
        },
        ...
    ]