loadFunc = function() {
                        var e = new enchant.Event('progress');
                        e.loaded = ++loaded;
                        e.total = len;
                        game.dispatchEvent(e);
                        if (loaded === len) {
                            game.removeScene(game.loadingScene);
                            game.dispatchEvent(new enchant.Event('load'));
                        }
                    }
Begin game.

Obeying the frame rate set in enchant.Game#fps, the frame in
enchant.Game#currentScene will be updated. When a preloaded image is present,
loading will begin and the loading screen will be displayed.