把上面的数据格式改成下面这种格式的，给二级的每个对象里面加三个属性

baseGrowthTreeDTOList: [
        {
          nodeId: '87792989543447310672893548139712',
          nodeName: '一年级',
          childTreeList: [
            {
              nodeId: '87956107174299611063652915548692',
              nodeName: '一年级1班',
            },
            {
              nodeId: '87956107185871011064476605111923',
              nodeName: '一年级2班',
            },
          ],
        },
        {
          nodeId: '87793284944518910674821521775005',
          nodeName: '二年级',
          childTreeList: [
            {
              nodeId: '87956575445844911065467284430780',
              nodeName: '二年级1班',
            },
            {
              nodeId: '87956575457900911066295625034240',
              nodeName: '二年级2班',
            },
          ],
        },
      ],

把上面的数据格式改成下面这种格式的，给二级的每个对象里面加三个属性

```javascript

baseGrowthTreeDTOList: [
        {
          nodeId: '87792989543447310672893548139712',
          nodeName: '一年级',
          childTreeList: [
            {
              nodeId: '87956107174299611063652915548692',
              nodeName: '一年级1班',
              show: false,
              value: '',
              result: [],
            },
            {
              nodeId: '87956107185871011064476605111923',
              nodeName: '一年级2班',
              show: false,
              value: '',
              result: [],
            },
          ],
        },
        {
          nodeId: '87793284944518910674821521775005',
          nodeName: '二年级',
          childTreeList: [
            {
              nodeId: '87956575445844911065467284430780',
              nodeName: '二年级1班',
              show: false,
              value: '',
              result: [],
            },
            {
              nodeId: '87956575457900911066295625034240',
              nodeName: '二年级2班',
              show: false,
              value: '',
              result: [],
            },
          ],
        },
      ],

```

该回答引用GPTᴼᴾᴱᴺᴬᴵ
可以使用数组的 forEach 方法和对象的解构来遍历并添加属性，可以按照如下方式实现：

const data = {
  baseGrowthTreeDTOList: [
    {
      nodeId: '87792989543447310672893548139712',
      nodeName: '一年级',
      childTreeList: [
        {
          nodeId: '87956107174299611063652915548692',
          nodeName: '一年级1班',
        },
        {
          nodeId: '87956107185871011064476605111923',
          nodeName: '一年级2班',
        },
      ],
    },
    {
      nodeId: '87793284944518910674821521775005',
      nodeName: '二年级',
      childTreeList: [
        {
          nodeId: '87956575445844911065467284430780',
          nodeName: '二年级1班',
        },
        {
          nodeId: '87956575457900911066295625034240',
          nodeName: '二年级2班',
        },
      ],
    },
  ],
};

data.baseGrowthTreeDTOList.forEach((item) => {
  item.childTreeList.forEach((childItem) => {
    // 给每个二级对象添加三个属性
    childItem.show = false;
    childItem.value = '';
    childItem.result = [];
  });
});

console.log(data);

输出结果如下：

{
  baseGrowthTreeDTOList: [
    {
      nodeId: '87792989543447310672893548139712',
      nodeName: '一年级',
      childTreeList: [
        {
          nodeId: '87956107174299611063652915548692',
          nodeName: '一年级1班',
          show: false,
          value: '',
          result: []
        },
        {
          nodeId: '87956107185871011064476605111923',
          nodeName: '一年级2班',
          show: false,
          value: '',
          result: []
        }
      ]
    },
    {
      nodeId: '87793284944518910674821521775005',
      nodeName: '二年级',
      childTreeList: [
        {
          nodeId: '87956575445844911065467284430780',
          nodeName: '二年级1班',
          show: false,
          value: '',
          result: []
        },
        {
          nodeId: '87956575457900911066295625034240',
          nodeName: '二年级2班',
          show: false,
          value: '',
          result: []
        }
      ]
    }
  ]
}

参考GPT和自己的思路，以下是将第一种数据格式转换成第二种数据格式的完整代码：

// 遍历一级节点
for (let i = 0; i < baseGrowthTreeDTOList.length; i++) {
  // 给二级节点添加属性
  for (let j = 0; j < baseGrowthTreeDTOList[i].childTreeList.length; j++) {
    baseGrowthTreeDTOList[i].childTreeList[j].show = false;
    baseGrowthTreeDTOList[i].childTreeList[j].value = '';
    baseGrowthTreeDTOList[i].childTreeList[j].result = [];
  }
}

回答不易，还请采纳！！！

参考GPT和自己的思路：以下是将原数据格式转换为新数据格式的 JavaScript 代码：

const oldData = {
  data: {
    baseGrowthTreeDTOList: [
      {
        nodeId: "87792989543447310672893548139712",
        nodeName: "一年级",
        childTreeList: [
          {
            nodeId: "87956107174299611063652915548692",
            nodeName: "一年级1班"
          },
          {
            nodeId: "87956107185871011064476605111923",
            nodeName: "一年级2班"
          }
        ]
      },
      {
        nodeId: "87793284944518910674821521775005",
        nodeName: "二年级",
        childTreeList: [
          {
            nodeId: "87956575445844911065467284430780",
            nodeName: "二年级1班"
          },
          {
            nodeId: "87956575457900911066295625034240",
            nodeName: "二年级2班"
          }
        ]
      }
    ]
  }
};

const newData = {
  data: {
    baseGrowthTreeDTOList: oldData.data.baseGrowthTreeDTOList.map(grade => ({
      nodeId: grade.nodeId,
      nodeName: grade.nodeName,
      childTreeList: grade.childTreeList.map(klass => ({
        nodeId: klass.nodeId,
        nodeName: klass.nodeName,
        show: false,
        value: "",
        result: []
      }))
    }))
  }
};

console.log(newData);

需要注意的是，由于原数据格式中每个对象的属性名与新数据格式中的属性名不完全一致，因此需要在转换时重新定义对象的属性名。

let data = {
    baseGrowthTreeDTOList: [
        {
            nodeId: '87792989543447310672893548139712',
            nodeName: '一年级',
            childTreeList: [
                {
                    nodeId: '87956107174299611063652915548692',
                    nodeName: '一年级1班',
                },
                {
                    nodeId: '87956107185871011064476605111923',
                    nodeName: '一年级2班',
                },
            ],
        },
        {
            nodeId: '87793284944518910674821521775005',
            nodeName: '二年级',
            childTreeList: [
                {
                    nodeId: '87956575445844911065467284430780',
                    nodeName: '二年级1班',
                },
                {
                    nodeId: '87956575457900911066295625034240',
                    nodeName: '二年级2班',
                },
            ],
        },
    ],
}

data.baseGrowthTreeDTOList.forEach(item => item.childTreeList.forEach(subItem => {
    subItem.show = false
    subItem.value = ''
    subItem.result = []
}))

console.log(JSON.stringify(data.baseGrowthTreeDTOList))

望采纳！

baseGrowthTreeDTOList: [
        {
          nodeId: '87792989543447310672893548139712',
          nodeName: '一年级',
          childTreeList: [
            {
              nodeId: '87956107174299611063652915548692',
              nodeName: '一年级1班',
              show: false,
              value: '',
              result: [],
            },
            {
              nodeId: '87956107185871011064476605111923',
              nodeName: '一年级2班',
              show: false,
              value: '',
              result: [],
            },
          ],
        },
        {
          nodeId: '87793284944518910674821521775005',
          nodeName: '二年级',
          childTreeList: [
            {
              nodeId: '87956575445844911065467284430780',
              nodeName: '二年级1班',
              show: false,
              value: '',
              result: [],
            },
            {
              nodeId: '87956575457900911066295625034240',
              nodeName: '二年级2班',
              show: false,
              value: '',
              result: [],
            },
          ],
        },
      ],

基于最新版ChatGPT4的回答，望采纳，有其他问题也可以询问我哦（最新版更智能，功能更加强大）：
要将原始数据结构转换为所需的格式，你可以使用JavaScript的map函数。这是一个示例实现：

const originalData = {
  baseGrowthTreeDTOList: [
    {
      nodeId: '87792989543447310672893548139712',
      nodeName: '一年级',
      childTreeList: [
        {
          nodeId: '87956107174299611063652915548692',
          nodeName: '一年级1班',
        },
        {
          nodeId: '87956107185871011064476605111923',
          nodeName: '一年级2班',
        },
      ],
    },
    {
      nodeId: '87793284944518910674821521775005',
      nodeName: '二年级',
      childTreeList: [
        {
          nodeId: '87956575445844911065467284430780',
          nodeName: '二年级1班',
        },
        {
          nodeId: '87956575457900911066295625034240',
          nodeName: '二年级2班',
        },
      ],
    },
  ],
};

const modifiedData = {
  baseGrowthTreeDTOList: originalData.baseGrowthTreeDTOList.map((grade) => {
    return {
      ...grade,
      childTreeList: grade.childTreeList.map((classItem) => {
        return {
          ...classItem,
          show: false,
          value: '',
          result: [],
        };
      }),
    };
  }),
};

console.log(modifiedData);

这将输出所需的数据结构。通过遍历baseGrowthTreeDTOList数组并映射每个一级对象，然后在其中再遍历childTreeList数组并映射每个二级对象，同时为每个二级对象添加show、value和result属性。