JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://amatiasq.com/fiddle-console.js"></script>

JavaScript

function A() { }
A.prototype.fun = function() {
    return "uno";
};
A.prototype.booring = function() {
		console.log(this.fun);
    conselo.log(A.prototype.fun.call(this));
    return "booring";
};

function B() { }
B.prototype = Object.create(A.prototype);
B.prototype.fun = function() {
    return "dos";
};
B.prototype.funciona2 = function() {
    return "prueba";
};

var b = new B();
console.log(b.fun());
console.log(b.booring());