JSFiddle - React, Tailwind, and code Playground

CSS

body {
    background-image: url('http://fc00.deviantart.net/fs39/f/2009/002/0/1/flower_by_bubbles238.jpg')
}

JavaScript

$(function(){
    $('<img>').attr('src',function(){
        var imgUrl = $('body').css('background-image');
        imgUrl = imgUrl .substring(4, imgUrl .length-1);
        return imgUrl;
    }).load(function(){
       alert('image loaded');
    });
});