JavaScript vs Django - What's the Difference?

I wanted to make this new sort of management site completely first class SPA. So it was all of the front end was defined effectively in PHP. I then slapped on a bunch of JavaScript to try and make it a bit more of an SPA. In the end, Durandall, which isn't that well known, the guy who wrote it now works at Microsoft. But just look up Aurelia. Rob Eisenberg, is that right? That's the one.