retina.js is an open source script that makes it easy to serve high-resolution images to devices with retina displays
What the script does is loop all images and do a HEAD
request to the guessed @2X
version in order to see if it exists. On success the retina version will be loaded in. Of course you’ll need to keep your naming scheme consistent.
Retina graphics for your website →
Retina.js Source (GitHub) →