访问和替换json中的子类别对象

{
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Street",
    "city": "City",
    "country": "Country"
  }
}

const json = {
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Street",
    "city": "City",
    "country": "Country"
  }
};

console.log(json.address.street); // 输出：123 Street

const json = {
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Street",
    "city": "City",
    "country": "Country"
  }
};

const property = "street";
console.log(json.address[property]); // 输出：123 Street

const json = {
  "name": "John",
  "age": 25,
  "address": {
    "street": "123 Street",
    "city": "City",
    "country": "Country"
  }
};

json.address.street = "456 Street";
console.log(json.address.street); // 输出：456 Street