初始化后在对象中公开和使用特权方法

class Person {
    constructor(name, age) {
        let _name = name; // 私有属性
        let _age = age;   // 私有属性

        this.getName = function() {
            return _name;
        };

        this.getAge = function() {
            return _age;
        };

        this.setName = function(newName) {
            if (typeof newName === 'string') {
                _name = newName;
            } else {
                console.error('Invalid name');
            }
        };

        this.setAge = function(newAge) {
            if (typeof newAge === 'number' && newAge >= 0) {
                _age = newAge;
            } else {
                console.error('Invalid age');
            }
        };
    }
}

// 使用示例
const person = new Person('Alice', 30);
console.log(person.getName()); // 输出: Alice
console.log(person.getAge());   // 输出: 30

person.setName('Bob');
person.setAge(35);
console.log(person.getName()); // 输出: Bob
console.log(person.getAge());   // 输出: 35

class Person {
    constructor(name, age) {
        let _name = name;
        let _age = age;

        this.getName = function() {
            return _name;
        };

        this.getAge = function() {
            return _age;
        };

        this.setName = function(newName) {
            if (typeof newName === 'string') {
                _name = newName;
            } else {
                console.error('Invalid name');
            }
        };

        this.setAge = function(newAge) {
            if (typeof newAge === 'number' && newAge >= 0) {
                _age = newAge;
            } else {
                console.error('Invalid age');
            }
        };
    }
}

// 将特权方法移到原型上
Person.prototype.getName = function() {
    return this._name;
};

Person.prototype.getAge = function() {
    return this._age;
};

Person.prototype.setName = function(newName) {
    if (typeof newName === 'string') {
        this._name = newName;
    } else {
        console.error('Invalid name');
    }
};

Person.prototype.setAge = function(newAge) {
    if (typeof newAge === 'number' && newAge >= 0) {
        this._age = newAge;
    } else {
        console.error('Invalid age');
    }
};

// 使用示例
const person = new Person('Alice', 30);
console.log(person.getName()); // 输出: Alice
console.log(person.getAge());   // 输出: 30

person.setName('Bob');
person.setAge(35);
console.log(person.getName()); // 输出: Bob
console.log(person.getAge());   // 输出: 35