1  //数据对象
 2  let items = {
 3             a: {
 4                 _id: 'aaaaaa',
 5             },
 6             b: {
 7                 _id: 'bbbbbb',
 8             },
 9             c: {
10                 1: {
11                     _id: 'cccccc1',
12                 },
13                 2: {
14                     _id: 'cccccc2',
15                 }
16             }
17         }
18 
19         //获取数据
20         for (let i in items) {
21 
22             if (i == 'a' || i == 'b') {
23 
24                 console.log('items: ' + i + " : _id = " + items[i]._id)
25 
26             } else if (i == 'c') {
27 
28                 for (let j in items[i]) {
29 
30                     console.log('items: ' + i + j + " : _id = " + items[i][j]._id)
31 
32                 }
33 
34             }
35         }