如何知道JavaScript/ES6中给定类的祖先类 [英] How to know the ancestor-classes of a given class in JavaScript/ES6

问题描述

var A = class A {};
var B = class B extends A {};
var C = class C extends B {};

鉴于上面的代码假设我只能访问"C"类，我怎么知道它的祖先类是什么?正确的答案当然是B然后是A，但是我的代码如何告诉我呢?

Given the code above assuming I only have access to class 'C', how can I know what are its ancestor classes? The correct answer of course is B then A, but how can my code tell me that?

推荐答案

您可以迭代C.prototype的原型链并获取原型的constructor属性.

You can iterate the prototype chain of C.prototype and get the prototype's constructor property.

var A = class A {};
var B = class B extends A {};
var C = class C extends B {};

var proto = C.prototype;
while (proto !== Object.prototype) {
  console.log(proto.constructor.name, proto.constructor);
  proto = Object.getPrototypeOf(proto);
} 

这篇关于如何知道JavaScript/ES6中给定类的祖先类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！