JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<span>Test</span>

JavaScript

$(document).ready(function(){

            $("span").click(function(){
            		alert($(this).css('background-color'));
                    if($(this).css('background-color') != 'black'){
                        $(this).css('background-color', 'black');
                    }
                    else if($(this).css('background-color') === 'black'){
                        $(this).css('background-color', 'white');
                    }
			});
});