React v0.13 released(facebook.github.io)

  bar() {
    this.whatever = 3;
  }

    function Bar() {
      Foo.call(this);
    }

    Bar.prototype = Object.create(Foo.prototype);
    Bar.prototype.constructor = Bar;

    Foo.prototype.thing = function() { ....

    function super(obj, method) {
        for (var p = obj.prototype; p; p = p.prototype)
            if (p[method])
                return p[method];
        throw method+" not found";
    }

    subclass.prototype.overridden = function(x,y) {
        super(this, 'some_overriden_method').call(this, x, y);
        // ...
    }