I'd say JQuery and ExJS were part of the same era. JQuery was used by a lot of people that didn't embrace javascript at all and tried to not use it (e.g ASP.NET

I'd say JQuery and ExJS were part of the same era. JQuery was used by a lot of people that didn't embrace javascript at all and tried to not use it (e.g ASP.NET coders) I feel like backbone deserves its own era as it seemed like all the cool kids would exclusively use that for a couple years. Then Angular and a ton of others flooded the scene.