Edit in JSFiddle

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

A.on('say:hi', function () {
    console.log('Hi'); 
});

A.on('say:hello', function () {
    console.log('Hello'); 
});

//trigger say:hi and say:hello, notice I can call two events with one trigger
A.trigger('say:hi say:hello');

//FYI this does not trigger both
A.trigger('say');