JavaScript 中常见的几种继承方式详解

function Parent(name) {
  this.name = name
}
Parent.prototype.getName = function(){
  return 'parentPrototype' + ' ' + this.name;
}
function Son() {
}
Son.prototype = new Parent();
console.log(new Son())

function Parent(name) {
  this.name = name
}
Parent.prototype.getName = function(){
  return 'parentPrototype' + ' ' + this.name;
}
function Son(name) {
  Parent.call(this, name)
}

console.log(new Son('jack'))

function Parent(name) {
  this.name = name
}
Parent.prototype.getName = function(){
  return 'parentPrototype' + ' ' + this.name;
}
function Son(name) {
  Parent.call(this, name) // 第二次调用
}
Son.prototype = new Parent() // 第一次调用
console.log(new Son('jack'))

const parent = {
  name: 'jack',
  getName() {
    return this.name
  }
}
const son = Object.create(parent)
console.log(son)

const parent = {
  name: 'jack',
  getName() {
    return this.name
  }
}
const son = Object.create(parent, {
  age: {
    value: 18,
    enumerable: true,
    writable: true,
    configurable: true
  }
})
console.log(son)

const parent = {
  name: 'jack',
  getName() {
    return this.name
  }
}
function createObj(origin){
  const res = Object(origin);
  res.age = 18;
  res.getAge = function() {
    return this.age
  };
  return res
}
const son = createObj(parent)
console.log(son)

function Parent(name) {
  this.name = name;
}
Parent.prototype.getName = function () {
  return this.name;
}
function Son(name) {
  Parent.call(this, name)
};
function inhertPrototype(Son, Parent) {
  const res = Object(Parent.prototype); // 创建目标对象的原型对象
  // 可以理解为复制父类对象prototype的属性，这样做可以少调用一次父类的实例化操作
  res.constructor = Son // 将构造函数指向son
  Son.prototype = res //将子类的prototype 指向父类创建的原型对象，这样子类既可以使用父类的方法，又不用实例化父类
}
inhertPrototype(Son, Parent)
console.log(new Son('jack'))