过滤JavaScript中的嵌套对象

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

  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      const value = obj[key];

      if (typeof value === 'object' && value !== null) {
        result[key] = filterNestedObject(value, condition);
      } else if (condition(key, value)) {
        result[key] = value;
      }
    }
  }

  return result;
}

const obj = {
  name: 'John',
  age: 30,
  address: {
    street: '123 Main St',
    city: 'New York',
    country: 'USA'
  }
};

const filteredObj = filterNestedObject(obj, (key, value) => key !== 'country');
console.log(filteredObj);

{
  name: 'John',
  age: 30,
  address: {
    street: '123 Main St',
    city: 'New York'
  }
}