Using Mixin for sharing code within different Views

mixin.js

App.Mixins.Navigation = {

  toggle: function() { /* ... */ },

  open: function() { /*... */ },

  close: function() { /* ... */ }

};

App.Menu = Backbone.View.extend({
  // I need to know how to toggle, open, and close!
});

_.extend(App.Views.Menu.prototype, App.Mixins.Navigation);

App.Tabs = Backbone.View.extend({
  // I too need to know how to toggle, open, and close!
});

_.extend(App.Views.Tabs.prototype, App.Mixins.Navigation);


//different syntax

App.Views.Menu = Backbone.View.extend(
  _.extend({}, App.Mixins.Navigation, {

  // (Methods and attributes here)

}));

App.Views.Tabs = Backbone.View.extend(
  _.extend({}, App.Mixins.Navigation, {

  // (Methods and attributes here)

}));