如何从json对象获取数据

var person = {
  "name": "John",
  "age": 30
};

var name = person.name; // 获取"name"属性的值
var age = person.age; // 获取"age"属性的值

var person = {
  "first name": "John",
  "last name": "Doe"
};

var firstName = person["first name"]; // 获取"first name"属性的值
var lastName = person["last name"]; // 获取"last name"属性的值

var propertyName = "first name";
var value = person[propertyName]; // 获取属性名存储在变量中的属性的值

var jsonArray = [
  {"name": "John", "age": 30},
  {"name": "Jane", "age": 25},
  {"name": "Bob", "age": 35}
];

for (var i = 0; i < jsonArray.length; i++) {
  var name = jsonArray[i].name; // 获取每个元素的"name"属性的值
  var age = jsonArray[i].age; // 获取每个元素的"age"属性的值
}

var person = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

var {name, age} = person; // 获取"name"和"age"属性的值