basecannon.js

var PlayerController = function PlayerController(opts) {
  this.model = PlayerModel.create({
    blah: 'blah'
  });
  keyCodes.on('keyDown', function (direction) {
    this[direction]();
  }, this); // third arg is context of `this`
};

PlayerController.prototype = {
  up: function () {
    this.model.velY = 1;
  }
}

exports.create = function create(opts) {
  return new PlayerController(opts);
};