examples/grow21/client/lib/crafty.js
function (e) { 
                var e = e || window.event; 

                if (typeof callback === 'function') {
                    callback.call(ctx, e);
                }
            }
function (e) { 
                var e = e || window.event; 

                if (typeof callback === 'function') {
                    callback.call(ctx, e);
                }
            }
function ( e ) { var e = e || window . event ; if ( typeof callback === 'function' ) { callback . call ( ctx , e ) ; } }
save anonymous function to be able to remove
save anonymous function to be able to remove