构造函数原型内存图-实现继承

2021-09-26 12:07:01   0  举报





俩个不相关的构造函数实现继承在内存中的体现

前端知识

模版推荐

作者其他创作

大纲/内容

GO ={NumberWindowPerson: 0x100Student: 0x500stu: 0x800p: 0x900}

0x600: Student.prototype.__proto__

0x300: Person.prototype.__proto__

0x400: eating

函数

function() {    log(this.name + ' studying')}

key

value

__proto__

0x600  0x900

...

内存

0x500: Student

原型链实现继承

scope-chain

Prototype

0x200

代码块

function() {    log(this.name + ' eating')}

function Person() {    this.name = 'tom'}Person.prototype.eating = function() {    log(this.name + ' eating')}function Student() {    this.sno = 111}var p = new Person()Student.prototype = pStudent.prototype.studying = function() {     log(this.name + ' studying')}var stu = new Student()

0x900: new Person的对象

ECS

0x100: Person

0x101: studying

0x600 0x900

0x101

null

constructor

0x500

0x600

studying

0x700