TS/JS如何找到对象嵌套属性的索引？

function findIndexRecursive(obj: any, targetProperty: string): string | null {
  for (const key in obj) {
    if (key === targetProperty) {
      return key;
    }
    if (typeof obj[key] === 'object') {
      const result = findIndexRecursive(obj[key], targetProperty);
      if (result !== null) {
        return key + '.' + result;
      }
    }
  }
  return null;
}

const obj = {
  a: {
    b: {
      c: 'value'
    }
  }
};

const targetProperty = 'c';
const index = findIndexRecursive(obj, targetProperty);
console.log(index); // 输出：a.b.c

function findIndexIterative(obj: any, targetProperty: string): string | null {
  const stack = [{ obj, path: '' }];

  while (stack.length > 0) {
    const { obj, path } = stack.pop()!;
    for (const key in obj) {
      const currentPath = path === '' ? key : path + '.' + key;
      if (currentPath === targetProperty) {
        return currentPath;
      }
      if (typeof obj[key] === 'object') {
        stack.push({ obj: obj[key], path: currentPath });
      }
    }
  }

  return null;
}

const obj = {
  a: {
    b: {
      c: 'value'
    }
  }
};

const targetProperty = 'c';
const index = findIndexIterative(obj, targetProperty);
console.log(index); // 输出：a.b.c