on page http://127.0.0.1:8000/admin/cms/page/ create root page with some content, and, say, page with slug 'test2' hooked with 'My App' application (advanced settings tab). make sure that pages are published and you also clicked "publish draft" button. then test it.
see info on apphooks.
to reproduce it you could use my test project: https://github.com/szelga/js-cms-test
on page http://127.0.0.1:8000/admin/cms/page/ create root page with some content, and, say, page with slug 'test2' hooked with 'My App' application (advanced settings tab). make sure that pages are published and you also clicked "publish draft" button. then test it.
on page http://localhost:8000/djangojs/init.js hooked app is not displayed, and it should be something like