9. Ajax

Ajax is a big topic in the computing world—and it’s a big topic in Dojo, too. Dojo is emerging as the premiere JavaScript library for Ajax.

Ajax allows browsers to fetch data from the server without a page refresh, so you don’t get any of that flash and flicker so common in the browsing experience. Instead, Ajaxenabled Web pages look and feel much more like desktop applications: you click a button, and the data you want appears somewhere in the page. The whole page stays the same except for that data.