This version is old school. Please find jQuery plugins on npm.

jQuery Responsive Lazy Loader

by J-Et. Martin

Allow you to load image renditions according to the current mediaqueries and/or CSS display such as a grid system. For example, it allows you to load large images on retina display and small ones on other devices. It can be used with a flickr account as well as with CMS renditions and a grid system as bootstrap or some custom HTML structure.