javascriptにおける継承の実装サンプル

authentication.js

module.exports = Authentication;

// @Constructor
function Authentication(name) {
  this._name = name;
};

Authentication.prototype._login = function(loginId, password) {
    throw new Error("not implemented");
};

Authentication.prototype.login = function(loginId, password) {
  this._login(loginId, password).then(function(data) {
    console.log("login success.");
    console.log(data);
  }).catch(function(err) {
    console.log("login failure");
    console.log(err);
  });
};

Authentication.prototype.getName = function() {
  return this._name;
};

Authentication.prototype.echo = function(text) {
  console.log(text);
};

client.js

var IceWall = require("./icewall");

debugger;
var inst = new IceWall();
inst.getName();
inst.echo("hi hi");
inst.login("myname", "mypassword");

icewall.js

var Authentication = require("./authentication");
var Util = require("./util");

module.exports = IceWall;

function IceWall() {
  Authentication.call(this, "icewall");
};

Util.inherits(IceWall, Authentication);

IceWall.prototype._login = function(loginId, password) {
  console.log("login to icewall : " + loginId);
  return Promise.resolve(loginId);
};

util.js

exports.inherits = function(childConstructor, parentConstructor) {
  Object.setPrototypeOf(childConstructor.prototype, parentConstructor.prototype);
};

ここを参考にした
http://qiita.com/norami_dream/items/ea3827f05699afcb1cc5
http://www.yunabe.jp/docs/javascript_class_in_google.html