Edit in JSFiddle

//extend the A object with Backbone.Events methods
var A = _.extend({name:'A'}, Backbone.Events);

//check A to see if it has been extended with the Backbone.Events methods
console.log(Object.keys(A));

/*above logs:

["name", "on", "once", "off", "trigger", "stopListening", "listenTo", "listenToOnce", "bind", "unbind"]

*/