使用for...in chrome控制台嵌套对象键值对返回undefined

function iterateNestedObject(obj) {
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (typeof obj[key] === 'object' && obj[key] !== null) {
        iterateNestedObject(obj[key]); // 递归遍历嵌套对象
      } else {
        console.log(key + ': ' + obj[key]);
      }
    }
  }
}

// 示例嵌套对象
let nestedObject = {
  name: 'John',
  age: 30,
  address: {
    street: '123 Main St',
    city: 'New York',
    country: 'USA'
  }
};

// 调用函数遍历嵌套对象
iterateNestedObject(nestedObject);

name: John
age: 30
street: 123 Main St
city: New York
country: USA