2018-11-21

var arr = [
  {
    name: '零',
    key: 0,
    age: 10,
    child: [
      {
        name: '一',
        key: 1,
        age: 18,
      },
      {
        name: '二',
        key: 2,
        age: 20,
      },
      {
        name: '三',
        key: 3,
        age: 23,
        child: [
          {
            name: '四',
            key: 4,
            age: 24,
          },
          {
            name: '五',
            key: 5,
            age: 25,
          },
        ],
      },
    ],
  },
  {
    name: '六',
    key: 6,
    age: 16,
    child: [
      {
        name: '八',
        key: 8,
        age: 18,
      },
      {
        name: '九',
        key: 9,
        age: 29,
        child: [
          {
            name: '十',
            key: 10,
            age: 20,
            child: [
              {
                name: '十一',
                key: 11,
                age: 15,
                child: [
                  {
                    name: '十二',
                    key: 12,
                    age: 21,
                  },
                  {
                    name: '十三',
                    key: 13,
                    age: 23,
                  }
                ]
              },
              {
                name: '十四',
                key: 14,
                age: 24,
              },
              {
                name: '十五',
                key: 15,
                age: 25,
                child: [
                  {
                    name: '十六',
                    key: 16,
                    age: 26,
                    child: [
                      {
                        name: '十七',
                        key: 17,
                        age: 29
                      },
                      {
                        name: '十八',
                        key: 18,
                        age: 20
                      }
                    ]
                  },
                  {
                    name: '十九',
                    key: 19,
                    age: 20
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  {
    name: '二十',
    key: 20,
    age: 17
  }
]