nw 注册快捷键

var option = {
            key : "Escape",
        };
        var shortcut = new gui.Shortcut(option);
        gui.App.registerGlobalHotKey(shortcut);
        shortcut.on('active', function() {
            toC.cancelFullScreen("",function(err,res){});
            gui.App.unregisterGlobalHotKey(shortcut);
        });