Backbone router.

router.js

class Router extends Backbone.Router {
    contructor(options){
    }

    get routes() {
        return {
            ':section': 'showSection',
            '*action': 'default',
        };
    }

    default() {
        this.showSection('default');
    }

    mostrarSeccion(section) {
        var section = section || 'default';

        $('.section').addClass('hidden');
        $('.section#' + seccion).removeClass('hidden')
            .find('form').removeClass('hidden');

        $('.tabs-container li a').removeClass('active');
        $('.tabs-container').find('li.' + section + ' a').addClass('active');
    }
};

let router = new Router();

// Initialize Backbone history.
if(!Backbone.History.started) {
    Backbone.history.start({pushState: false});
}