js私有变量 对象

function createPerson(name, age) {
    let _name = name; // 私有变量
    let _age = age;   // 私有变量

    return {
        getName: function() {
            return _name;
        },
        getAge: function() {
            return _age;
        },
        setName: function(newName) {
            _name = newName;
        },
        setAge: function(newAge) {
            _age = newAge;
        }
    };
}

const person = createPerson('Alice', 30);
console.log(person.getName()); // 输出: Alice
console.log(person.getAge());  // 输出: 30

// 无法直接访问私有变量
console.log(person._name); // 输出: undefined

class Person {
    #name;
    #age;

    constructor(name, age) {
        this.#name = name;
        this.#age = age;
    }

    getName() {
        return this.#name;
    }

    getAge() {
        return this.#age;
    }

    setName(newName) {
        this.#name = newName;
    }

    setAge(newAge) {
        this.#age = newAge;
    }
}

const person = new Person('Bob', 25);
console.log(person.getName()); // 输出: Bob
console.log(person.getAge());  // 输出: 25

// 无法直接访问私有变量
console.log(person.#name); // 语法错误: Private field '#name' must be declared in an enclosing class