根据 id 和 parent_id 的对应关系，进行下面的转换。

原始数据：

复制
1[
2  { "id": 12, "parent_id": 1, "name": "朝阳区" },
3  { "id": 241, "parent_id": 24, "name": "田林街道" },
4  { "id": 31, "parent_id": 3, "name": "广州市" },
5  { "id": 13, "parent_id": 1, "name": "昌平区" },
6  { "id": 2421, "parent_id": 242, "name": "上海科技绿洲" },
7  { "id": 21, "parent_id": 2, "name": "静安区" },
8  { "id": 242, "parent_id": 24, "name": "漕河泾街道" },
9  { "id": 22, "parent_id": 2, "name": "黄浦区" },
10  { "id": 11, "parent_id": 1, "name": "顺义区" },
11  { "id": 2, "parent_id": 0, "name": "上海市" },
12  { "id": 24, "parent_id": 2, "name": "徐汇区" },
13  { "id": 1, "parent_id": 0, "name": "北京市" },
14  { "id": 2422, "parent_id": 242, "name": "漕河泾开发区" },
15  { "id": 32, "parent_id": 3, "name": "深圳市" },
16  { "id": 33, "parent_id": 3, "name": "东莞市" },
17  { "id": 3, "parent_id": 0, "name": "广东省" }
18]

转换后的结构：

复制
1[{
2	"id": 2,
3	"parent_id": 0,
4	"name": "上海市",
5	"children": [{
6		"id": 21,
7		"parent_id": 2,
8		"name": "静安区",
9		"children": []
10	}, {
11		"id": 22,
12		"parent_id": 2,
13		"name": "黄浦区",
14		"children": []
15	}, {
16		"id": 24,
17		"parent_id": 2,
18		"name": "徐汇区",
19		"children": [{
20			"id": 241,
21			"parent_id": 24,
22			"name": "田林街道",
23			"children": []
24		}, {
25			"id": 242,
26			"parent_id": 24,
27			"name": "漕河泾街道",
28			"children": [{
29				"id": 2421,
30				"parent_id": 242,
31				"name": "上海科技绿洲",
32				"children": []
33			}, {
34				"id": 2422,
35				"parent_id": 242,
36				"name": "漕河泾开发区",
37				"children": []
38			}]
39		}]
40	}]
41}, {
42	"id": 1,
43	"parent_id": 0,
44	"name": "北京市",
45	"children": [{
46		"id": 12,
47		"parent_id": 1,
48		"name": "朝阳区",
49		"children": []
50	}, {
51		"id": 13,
52		"parent_id": 1,
53		"name": "昌平区",
54		"children": []
55	}, {
56		"id": 11,
57		"parent_id": 1,
58		"name": "顺义区",
59		"children": []
60	}]
61}, {
62	"id": 3,
63	"parent_id": 0,
64	"name": "广东省",
65	"children": [{
66		"id": 31,
67		"parent_id": 3,
68		"name": "广州市",
69		"children": []
70	}, {
71		"id": 32,
72		"parent_id": 3,
73		"name": "深圳市",
74		"children": []
75	}, {
76		"id": 33,
77		"parent_id": 3,
78		"name": "东莞市",
79		"children": []
80	}]
81}]