js 对象 与 对象实例

// 使用构造函数创建对象实例
function Person(name, age) {
    this.name = name;
    this.age = age;
}

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

const person1 = new Person('Alice', 30);
const person2 = new Person('Bob', 25);

person1.greet(); // 输出: Hello, my name is Alice and I am 30 years old.
person2.greet(); // 输出: Hello, my name is Bob and I am 25 years old.

const person = {
    name: 'Alice',
    age: 30,
    greet: function() {
        console.log(`Hello, my name is ${this.name} and I am ${this.age} years old.`);
    }
};

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

function Person(name, age) {
    this.name = name; // 每个实例独立的属性
    this.age = age;   // 每个实例独立的属性
}

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

const person1 = new Person('Alice', 30);
const person2 = new Person('Bob', 25);

person1.name = 'Alicia'; // 修改 person1 的 name 属性，不会影响 person2

console.log(person1.name); // 输出: Alicia
console.log(person2.name); // 输出: Bob