JSFiddle - React, Tailwind, and code Playground

HTML

<a class="popup" href="http://demoshop.jtl-software.de/Versandkosten?exclusive_content=1" title="Versand" ref="width=600,height=400,status=yes,scrollbars=yes,resizable=yes">Versand</a>

JavaScript

$(document).ready(function() {
    $('a.popup').each(function(index) {
        $(this).click(function(event) {
            fenster = window.open($(this).attr("href"),$(this).attr("title"),$(this).attr("ref"));
            fenster.focus();  
            event.preventDefault();
        });
    });
});