过滤嵌套结构的JavaScript对象

function filterNestedObject(obj, condition) {
  let result = {};

  for (let key in obj) {
    if (typeof obj[key] === 'object' && obj[key] !== null) {
      let nestedResult = filterNestedObject(obj[key], condition);
      if (Object.keys(nestedResult).length > 0) {
        result[key] = nestedResult;
      }
    } else if (condition(obj[key])) {
      result[key] = obj[key];
    }
  }

  return result;
}

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

// 过滤条件：值大于2
const condition = (value) => value > 2;

const filteredObj = filterNestedObject(nestedObj, condition);
console.log(filteredObj);
// 输出: { b: { d: { e: 3, f: 4 } }, g: 5 }