如何将JavaScript对象展平为菊花链形式？

function flattenObject(obj, prefix = '') {
  let result = {};
  
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      let propName = prefix ? `${prefix}.${key}` : key;
      
      if (typeof obj[key] === 'object' && obj[key] !== null) {
        let flatObj = flattenObject(obj[key], propName);
        result = { ...result, ...flatObj };
      } else {
        result[propName] = obj[key];
      }
    }
  }
  
  return result;
}

// 示例对象
let obj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3,
      f: {
        g: 4
      }
    }
  },
  h: 5
};

// 调用展平函数
let flattenedObj = flattenObject(obj);

console.log(flattenedObj);

{
  "a": 1,
  "b.c": 2,
  "b.d.e": 3,
  "b.d.f.g": 4,
  "h": 5
}