浅谈JavaScript的几种继承实现方式

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

Person.prototype.running = function() {
	console.log("running~")
}

Person.prototype.eating = function() {
	console.log("eating~")
}

function Student(name, age, height, address, sno, score) {
	this.age = age
	this.height = height
	this.address = address
	this.sno = sno
	this.score = score
}

Student.prototype.running = function() {
	console.log("running~")
}
Student.prototype.eating = function() {
	console.log("eating~")
}
Student.prototype.studying = function() {
	console.log("studying~")
}

function Student(age, height, address, sno, score) {
	this.age = age
	this.height = height
	this.address = address
	this.sno = sno
	this.score = score
}

+ Stuednt.prototype = Person.prototype

function Student(sno, score) {
	this.sno = sno
	this.score = score
}
+ var p = new Person()
+ Student.prototype = p

function Person(name, age, height, address) {
	this.name = name
	this.age = age
	this.height = height
	this.address = address
}
Person.prototype.running = ...

function Student(age, height, address, sno, score) {
+   Person.call(this, age, height, address)
	this.sno = sno
	this.score = score
}

Student.prototype = new Person()

var obj = {}
obj.__proto__ = Person.prototype
Student.prototype = obj

// __proto__为浏览器增加的属性, 解决浏览器兼容性问题可以改为
var obj = {}
Object.setPrototypeOf(obj, Person.prototype)
Student.prototype = obj

function F() {}
F.prototype = Person.prototype
Student.prototype = new F()

var obj = Object.create(Person.prototype)
Student.prototype = obj 

// 工具函数
// 创建对象的过程
function createObject(proto) {
	function F() {}
	F.prototype = proto 
	return new F()
}

// 将Subtype和Supertype联系在一起
// 寄生式函数
function inherit(Subtype, Supertype) {
	Subtype.prototype = createObject(Supertype.prototype)
	Object.defineProperty(Subtype.prototype, "constructor", {
		enumerable: false,
		configurable: true,
		writable: true,
		value: Subtype
	})
}

function Student(age, height, sno, score) {
	Person.call(this, age, height)
	this.sno = sno
	this.score = score
}

+ inherit(Student, Person)

// 使用方法
Student.prototype.studying = function() {
	console.log("studying")
}

createInfo(proto, age, height) {
	const newObj = this.createObject(proto)
	newObj.age = age
	newObj.height = height
	return newObj
}