JQuery is hard to beat
JQuery is hard to beat. Looking at the number of questions on Stack Overflow*, JQuery is 6X more popular than Google’s AngularJS, and 40X more popular than Ember.js. And Facebook’s React and Google’s web component framework Polymer have very little activity.
*Yes, more questions could mean that it’s just harder to learn, but I’m willing to bet there’s a tight correlation between number of users and the number of tagged questions on Stack Overflow.