JSFiddle - React, Tailwind, and code Playground

HTML

<a href="http://twitter.com/share"
    class="twitter-share-button"
    data-text="This is what we want to change dynamically"
    data-count="none" data-via="chris_camps">Tweet</a>
<!-- moved to the js above <script type="text/javascript"
    src="http://platform.twitter.com/widgets.js"></script> -->

JavaScript

$(document).ready(function(){
    $('a[data-text]').each(function(){
      $(this).attr('data-text', "This works!");
    });
    $.getScript('http://platform.twitter.com/widgets.js');
});