如何从父对象构造函数访问对象

function Parent(name) {
  this.name = name;
}

Parent.prototype.sayHello = function() {
  console.log("Hello, " + this.name + "!");
}

function Child(name, age) {
  Parent.call(this, name); // 调用父对象的构造函数
  this.age = age;
}

Child.prototype = Object.create(Parent.prototype);
Child.prototype.constructor = Child;

Child.prototype.introduce = function() {
  console.log("My name is " + this.name + " and I am " + this.age + " years old.");
}

var child = new Child("Alice", 10);
child.sayHello(); // 输出：Hello, Alice!
child.introduce(); // 输出：My name is Alice and I am 10 years old.