JSFiddle - React, Tailwind, and code Playground

HTML

<body class="page2 ttt">
<h1></h1>
</body>

JavaScript

$(document).ready(function() {
var pageClass = $("body").attr('class');
switch (pageClass) {
  case ("page1"):
    $('h1').html('heading1');
    break;
  case ("page2"):
     $('h1').html('heading2');
    break;
  default:
    $('h1').html('default');
}
});