Javascript继承：我们如何继承使用new运算符从函数创建对象的对象和函数，并具有原型函数

Question

I have fucntion A:

function A() {} 
A.prototype.fnA() = function(){}

create a object:

a = new A()

I have function B:

function B() {}
B.prototype.fnB = function(){}

I wish to inherit object a with instance of B so that new instace created will have proto functions of both A and B .

How can I do that ?

Answer 1

Following code does what you need:

 'use strict'; function A() { // ... } A.prototype.fnA = function () { console.log('Running fnA()'); }; function B() { // ... } B.prototype = new A(); B.prototype.fnB = function () { console.log('Running fnB()'); }; var b = new B(); b.fnA(); b.fnB();