通过递归获取节点层级及本身信息，将树同级节点放入同一个数组

Question

tableData: [
                {
                    docname: "1",
                    doccode:'a',
                    id:1,
                    num:6,
                    children: [
                        {
                            docname:'1-1',
                            doccode:'b',
                            num:3,
                            fid:1,
                            id:2,
                            children: [
                                {
                                    id:3,
                                    fid:2,
                                    docname:'1-1-1',
                                    doccode:'b1',
                                },
                                {
                                    id:4,
                                    fid:2,
                                    docname:'1-1-2',
                                    doccode:'b2',
                                },
                                {
                                    id:5,
                                    fid:2,
                                    docname:'1-1-3',
                                    doccode:'b3',
                                }
                            ]
                        },
                        {
                            docname:'1-2',
                            doccode:'c',
                            num:3,
                            children: [
                                {
                                    docname:'1-2-1',
                                    doccode:'c1',
                                },
                                {
                                    docname:'1-2-2',
                                    doccode:'c2',
                                },
                                {
                                    docname:'1-2-3',
                                    doccode:'c3',
                                }
                            ]
                        }
                    ]
                }
            ],

怎么讲上述树形结构数据通过递归改为:
[
[

  [1],
  [1-1, 1-2, ...],
  [1-1-1, 1-1-2, ...],
  [1-1-1-1, 1-1-1-2, ...],

],
[

  [2],
  [2-1,2-2,...]
  ....

]
]

Answer 1

let tableData =[
                {
                    docname: "1",
                    doccode:'a',
                    id:1,
                    num:6,
                    children: [
                        {
                            docname:'1-1',
                            doccode:'b',
                            num:3,
                            fid:1,
                            id:2,
                            children: [
                                {
                                    id:3,
                                    fid:2,
                                    docname:'1-1-1',
                                    doccode:'b1',
                                },
                                {
                                    id:4,
                                    fid:2,
                                    docname:'1-1-2',
                                    doccode:'b2',
                                },
                                {
                                    id:5,
                                    fid:2,
                                    docname:'1-1-3',
                                    doccode:'b3',
                                }
                            ]
                        },
                        {
                            docname:'1-2',
                            doccode:'c',
                            num:3,
                            children: [
                                {
                                    docname:'1-2-1',
                                    doccode:'c1',
                                },
                                {
                                    docname:'1-2-2',
                                    doccode:'c2',
                                },
                                {
                                    docname:'1-2-3',
                                    doccode:'c3',
                                }
                            ]
                        }
                    ]
                }
            ];
let getFieldVals=(list=[],key='',res=[])=>(res.push(list.map(item=>(item.children && getFieldVals(item.children,key,res),item[key]))),res);
getFieldVals(tableData,'docname').reverse();

0: ['1']
1: (2) ['1-1', '1-2']
2: (3) ['1-2-1', '1-2-2', '1-2-3']
3: (3) ['1-1-1', '1-1-2', '1-1-3']