Simple override of a Backbone class, View in this case. Can be applied to modal, collection, etc...

view-constructor-override.js

Backbone.View = (function(View) {

    // Define the new constructor
    Backbone.View = function(attributes, options) {

        // New constructor stuff here...
        
        // Call default constructor 
        View.apply(this, arguments);

        // Add some callbacks
        this.on('event', this.someCallback, this);
    };

    // Clone static properties
    _.extend(Backbone.View, View);

    // Clone prototype
    Backbone.View.prototype = (function(Prototype) {

        Prototype.prototype = View.prototype;

        return new Prototype;

    })(function() {});

    // Update constructor in prototype
    Backbone.View.prototype.constructor = Backbone.View;

    return Backbone.View;

})( Backbone.View );