从json获取属性

var json = {
  "name": "John",
  "age": 25,
  "city": "New York"
};

var name = json.name; // 获取name属性的值，结果为"John"
var age = json.age; // 获取age属性的值，结果为25
var city = json.city; // 获取city属性的值，结果为"New York"

var json = {
  "name": "John",
  "age": 25,
  "city": "New York"
};

var name = json["name"]; // 获取name属性的值，结果为"John"
var age = json["age"]; // 获取age属性的值，结果为25
var city = json["city"]; // 获取city属性的值，结果为"New York"

var json = {
  "person": {
    "name": "John",
    "age": 25,
    "city": "New York"
  }
};

var name = json.person.name; // 获取嵌套属性name的值，结果为"John"