JSFiddle - React, Tailwind, and code Playground

HTML

<div class="sprite-thumb">Run again and check the alert for background-url!</div>

CSS

.sprite-thumb {
    background-image:url(example.jpg);
}

JavaScript

var b = $('.sprite-thumb').css('background-image');
b = b.replace(/(^url\()|(\)$)/g, "");
alert(b);