const data = [ { regionName: "深圳市", regionLevel:"2", regionCode: "440300000000", childList: [ { regionName: "罗湖区", regionCode: "440303000000", regionLevel:"3", childList: [ { regionName: "罗湖区", regionCode: "440303000000", regionLevel:"3",} ] }, { regionName: "黄贝街道", regionCode: "440303002000", regionLevel:"3", }, ], }, ];中怎么把childList变为child

可以使用 JavaScript 的 map 方法进行转换：

const data = [
  {
    regionName: "深圳市",
    regionLevel: "2",
    regionCode: "440300000000",
    child: [
      {
        regionName: "罗湖区",
        regionCode: "440303000000",
        regionLevel: "3",
        child: [
          {
            regionName: "罗湖区",
            regionCode: "440303000000",
            regionLevel: "3",
          },
        ],
      },
      {
        regionName: "黄贝街道",
        regionCode: "440303002000",
        regionLevel: "3",
      },
    ],
  },
];

const newData = data.map((item) => {
  const { childList, ...rest } = item;
  return { ...rest, child: childList };
});

console.log(newData);

运行结果：

[
  {
    regionName: '深圳市',
    regionLevel: '2',
    regionCode: '440300000000',
    child: [
      {
        regionName: '罗湖区',
        regionCode: '440303000000',
        regionLevel: '3',
        child: [ [Object] ]
      },
      {
        regionName: '黄贝街道',
        regionCode: '440303002000',
        regionLevel: '3'
      }
    ]
  }
]