JS创建对象常用设计模式工厂构造函数及原型

// 汽车工厂
function carFactory(brand, price, district) {
	 let o = new Object();
	 o.brand= brand;
	 o.price= price;
	 o.district= district;
	 o.performance= function() {
		 console.log(this.brand);
	 };
	 return o;
}
// 生产汽车
let car1 = carFactory("Benz", 50, "china");
let car2= carFactory("Honda", 30, "usa");

// 糖果工厂
function candyFactory(name, size, color) {
	 let o = new Object();
	 o.name= name;
	 o.size= size;
	 o.color= color;
	 o.performance= function() {
		 console.log(this.name);
	 };
	 return o;
}
// 生产糖果
let candy1= candyFactory("Oreo", "small", "white");
let candy2= candyFactory("quduoduo", "middle", "black");

// 构造汽车的构造函数
function Car(brand, price, district) {
	 this.brand= brand;
	 this.price= price;
	 this.district= district;
	 this.performance= function() {
		 console.log(this.brand);
	 };
}
// 构造汽车
let car1 = new Car("Benz", 50, "china");
let car2= new Car("Honda", 30, "usa");

car1.__proto__===Car.prototype // true
car1 instanceof Car // true

// 构造汽车的构造函数
function Car(brand, price, district) {
	 this.brand= brand;
	 this.price= price;
	 this.district= district;
	 this.performance= function() {
	 };
}
// 构造汽车
let car1 = new Car("Benz", 50, "china");
let car2= new Car("Honda", 30, "usa");
car1.performance == car2.performance // false

// 原型创建
function Car(brand, price, district) {
	 Car.prototype.brand= brand;
	 Car.prototype.price= price;
	 Car.prototype.district= district;
	 Car.prototype.performance= function() {
	 };
}
let car1 = new Car("Benz", 50, "china");
let car2= new Car("Honda", 30, "usa");
car1.performance === car2.performance // true

car1.__proto__===Car.prototype // true
Car.__proto__===Function.prototype // true
Function.prototype.__proto__===Object.prototype //true
Car.prototype.__proto__===Object.prototype //true
Object.prototype.__proto__===null // true

function Person() {}
Person.prototype = {
 constructor: Person,
 friends: "A",
 sayName() {
 }
}; 
let person1 = new Person();
let person2 = new Person();
person1.friends="B";
person1.friends // 'B'
person2.friends // 'A'

function PersonArr() {}
PersonArr.prototype = {
 constructor: PersonArr,
 friends:["A"],
 sayName() {
 }
}; 
let person1 = new PersonArr();
let person2 = new PersonArr();
person1.friends.push("B");
person1.friends // ["A","B"]
person2.friends // ["A","B"]