在Javascript中填充JSON中的动态值

{
  "name": "John",
  "age": 30,
  "isStudent": false
}

// 创建一个JSON对象
let person = {
  name: "",
  age: null,
  isStudent: false
};

// 动态填充值
person.name = "Alice";
person.age = 25;
person.isStudent = true;

console.log(person);
// 输出: { name: 'Alice', age: 25, isStudent: true }

let person = {
  name: "",
  age: null,
  isStudent: false
};

// 使用变量作为键来动态填充值
let key = "name";
person[key] = "Bob";

console.log(person);
// 输出: { name: 'Bob', age: null, isStudent: false }

let person = {};

person.age = 30; // 自动创建了age属性
console.log(person); // 输出: { age: 30 }

let person = {};

if (!person.hasOwnProperty('age')) {
  person.age = 30;
}
console.log(person); // 输出: { age: 30 }

let person = {};

if ('age' in person) {
  person.age = 30;
} else {
  person.age = 30;
}
console.log(person); // 输出: { age: 30 }