Example of prototype in JS

PrototypeJs.js

//Global variable (like static)
App = {
	value: 1
};

/*
 * Mother class constructor
 */
function ClassA() {
	this.value = 1;
}

/*
 * Mother class function(s)
 */
ClassA.prototype = {
	suchWow: function() {
		this.value += 2;
		App.value += 4; 
	}
};

/**
 * daughter class
 * @param a Imply class inherited (ClassA)
 */
function ClassB(a) {
	ClassA.call(this, a);
}

/**
 * Some stuff for inheriting
 */
ClassB.prototype = Object.create(ClassA.prototype);
ClassB.prototype.constructor = ClassB;
/**
 * Redefine method suchWow of ClassA
 */
ClassB.prototype.suchWow = function() {
	this.value += 4;
	App.value += 2; 
};

// Init one mother, one daughter. See on daughter constructor, "a" parameter is implied ;)
var myA = new ClassA();
var myB = new ClassB();

//Such wow ! Such works ! Such power :D #doge
myA.suchWow();
myB.suchWow();

//Display some informations
console.log( App.value, myA.value, myB.value);

//To execute : npm yourFileName.js
//Install NPM : https://github.com/nodesource/distributions