retinable

checks if device have retina display

npm install retinable --save

to require module use

var retinable = require('retinable');

if (retinable()) {
    console.log("Your device have retina display");
}

Browser

<script src="dist/retinable.min.js"></script>
<script>
    if (retinable()) {
        console.log("Your device have retina display");
    }
</script>

Or use an AMD loader (such as RequireJS):

require(['dist/retinable.min.js'], function (Immutable) {
    if (retinable()) {
        console.log("Your device have retina display");
    }
});

retinable.suffix()

return @2x if device have retina display

var imgSrc = "/img/logo" + retinable.suffix() + '.png';