用es5代码实现es6的class类

function Person(name, age) {
    this.name = name;
    this.age = age;
}

Person.prototype.sayHello = function() {
    console.log('Hello, my name is ' + this.name + ', I am ' + this.age + ' years old.');
};

// 创建实例
var person1 = new Person('Alice', 30);
person1.sayHello(); // 输出: Hello, my name is Alice, I am 30 years old.