gistfile1.js

Proj.View.CustomView2 = Proj.View.CustomView.extend({
	initialize: function(opts) {
		//this is the equivalent of super()
		Proj.View.CustomView.prototype.initialize.call(this,opts);

		//....
	},

	render: function(opts) {
		//this is the equivalent of super()
		Proj.View.CustomView.prototype.render.call(this,opts);

		//....
	},

	//.... other methods and attributes

});