backbone-before-after.js

// save a reference to route() method
var $route = Backbone.Router.prototype.route;

// then override it
Backbone.Router.prototype.before = function() {}
Backbone.Router.prototype.after = function() {}
Backbone.Router.prototype.route = function(route, name, callback) {
  if (_.isFunction(name)) {
    callback = name;
    name = '';
  }

  if (!callback) {
    callback = this[name];
  }

  // wrap our initial callback with before() and after()
  var wrapped = _.bind(function() {
    this.before.apply(this, arguments);
    callback.apply(this, arguments);
    this.after.apply(this, arguments);
  }, this);

  return $route.call(this, route, name, wrapped);
};