js面向对象的封装方法

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

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

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

    this.setName = function(name) {
        _name = name;
    };

    this.setAge = function(age) {
        if (typeof age === 'number' && age > 0) {
            _age = age;
        }
    };
}

Person.prototype.greet = function() {
    console.log(`Hello, my name is ${this.getName()} and I am ${this.getAge()} years old.`);
};

const person = new Person('Alice', 30);
person.greet(); // 输出: Hello, my name is Alice and I am 30 years old.

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

        this.getName = () => _name;
        this.getAge = () => _age;
        this.setName = (name) => _name = name;
        this.setAge = (age) => {
            if (typeof age === 'number' && age > 0) {
                _age = age;
            }
        };
    }

    greet() {
        console.log(`Hello, my name is ${this.getName()} and I am ${this.getAge()} years old.`);
    }
}

const person = new Person('Bob', 25);
person.greet(); // 输出: Hello, my name is Bob and I am 25 years old.

function createPerson(name, age) {
    let _name = name;
    let _age = age;

    return {
        getName: function() {
            return _name;
        },
        getAge: function() {
            return _age;
        },
        setName: function(name) {
            _name = name;
        },
        setAge: function(age) {
            if (typeof age === 'number' && age > 0) {
                _age = age;
            }
        },
        greet: function() {
            console.log(`Hello, my name is ${_name} and I am ${_age} years old.`);
        }
    };
}

const person = createPerson('Charlie', 35);
person.greet(); // 输出: Hello, my name is Charlie and I am 35 years old.