index.js

const helloController = {
  __name: 'HelloController',
  __ready(context) {
    const page = context.args.data.page;
    const options = context.args.data.options;
    this.view.register(page.id, page.innerHTML);
    this.view.update('#app', page.id, options);
  },

  '#btn click'() {
  }
};