backbone-subviews.js

import Header from 'views/header';
import Content from 'views/content';
import Footer from 'views/footer';

const Page = Backbone.View.extend({
  render() {
    const attributes = this.model.attributes;
    
    this.headerView = new Header(this.$('.header'), attributes);
    this.contentView = new Content(this.$('.content'), attributes);
    this.footerView = new Footer(this.$('.footer'), attributes);
  
    this.headerView.render();
    this.contentView.render();
    this.footerView.render();
    
    return this;
  }
});

const pageView = new Page($('.page'));
pageView.render();