classes.js

var Bar, Foo, bar;
var __hasProp = Object.prototype.hasOwnProperty, __extends = function(child, parent) {
  for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; }
  function ctor() { this.constructor = child; }
  ctor.prototype = parent.prototype;
  child.prototype = new ctor;
  child.__super__ = parent.prototype;
  return child;
};
Foo = (function() {
  function Foo() {}
  Foo.prototype.word = function() {
    return 'foo';
  };
  Foo.prototype.say = function() {
    return alert(word());
  };
  return Foo;
})();
Bar = (function() {
  __extends(Bar, Foo);
  function Bar() {
    Bar.__super__.constructor.apply(this, arguments);
  }
  Bar.prototype.word = function() {
    return 'bar';
  };
  return Bar;
})();
bar = new Bar();
bar.say();