I am a huge fan of JavaScript myself mostly because I found it very fun to work with and that you can do anything with it at the moment (websites, games, native mobile apps, smart TV apps, program raspberry pies and much more). About single page apps now: don't do a SPA if your website is not really an interactive application. Do you have a game, photo editor, P2P video chat? If yes, go ahead, SPA is really great for those things but for God's sake do not create a single page app when your website actually has more pages with different content and no interactivity. Why try to emulate how a browser works (loading, rendering, etc...) inside the browser itself?
