从数组创建对象树

function createObjectTree(arr) {
  let tree = {};

  arr.forEach(item => {
    let keys = item.split('.');
    let currentNode = tree;

    keys.forEach((key, index) => {
      if (!currentNode[key]) {
        currentNode[key] = {};
      }

      if (index === keys.length - 1) {
        currentNode[key] = item;
      }

      currentNode = currentNode[key];
    });
  });

  return tree;
}

// 示例用法
let arr = ['a.b.c', 'a.b.d', 'a.e.f', 'g.h'];
let objectTree = createObjectTree(arr);
console.log(objectTree);

{
  "a": {
    "b": {
      "c": "a.b.c",
      "d": "a.b.d"
    },
    "e": {
      "f": "a.e.f"
    }
  },
  "g": {
    "h": "g.h"
  }
}