从Typescript类创建JSON对象

class Person {
  name: string;
  age: number;

  constructor(name: string, age: number) {
    this.name = name;
    this.age = age;
  }
}

// 创建一个Person实例
const person = new Person("Alice", 30);

// 将Person实例转换为JSON字符串
const jsonString = JSON.stringify(person);
console.log(jsonString); // 输出: {"name":"Alice","age":30}

// 如果需要直接获取对象的键值对表示，可以直接使用对象本身
const jsonObject = person;
console.log(jsonObject); // 输出: Person { name: 'Alice', age: 30 }

class Example {
  a: number;
  b: () => void;
  c?: string;

  constructor(a: number, b: () => void, c?: string) {
    this.a = a;
    this.b = b;
    this.c = c;
  }
}

const example = new Example(1, () => console.log("function"), undefined);

// 自定义序列化方法
const safeToJSON = (key: string, value: any) => {
  if (typeof value === "function") return undefined;
  if (value === undefined) return null; // 或者其他默认值
  return value;
};

const jsonString = JSON.stringify(example, safeToJSON);
console.log(jsonString); // 输出: {"a":1,"c":null}