JS函数怎样定义函数原型_JS函数原型定义与继承机制实现方法

function Person(name) {
  this.name = name;
}
Person.prototype.sayHello = function() {
  console.log("Hello, I'm " + this.name);
};
const person1 = new Person("Alice");
person1.sayHello(); // 输出: Hello, I'm Alice

function Animal() {
  this.type = "animal";
}
Animal.prototype.eat = function() {
  console.log(this.name + " is eating.");
};

function Dog(name) {
  this.name = name;
}
Dog.prototype = new Animal(); // 继承Animal

const dog = new Dog("Buddy");
dog.eat(); // 输出: Buddy is eating.

function Animal(name) {
  this.name = name;
}
Animal.prototype.eat = function() {
  console.log(this.name + " is eating.");
};

function Dog(name, breed) {
  Animal.call(this, name); // 继承属性
  this.breed = breed;
}
Dog.prototype = Object.create(Animal.prototype); // 继承方法
Dog.prototype.constructor = Dog; // 修正构造器指向

const dog = new Dog("Max", "Golden Retriever");
dog.eat(); // 输出: Max is eating.

class Animal {
  constructor(name) {
    this.name = name;
  }
  eat() {
  console.log(this.name + " is eating.");
  }
}

class Dog extends Animal {
  constructor(name, breed) {
    super(name);
    this.breed = breed;
  }
  bark() {
    console.log("Woof!");
  }
}

const dog = new Dog("Rex", "Husky");
dog.eat(); // Rex is eating.
dog.bark(); // Woof!