JSFiddle - React, Tailwind, and code Playground

HTML

<a class="mylink" href="http://google.com">test</a>

JavaScript

$(document).ready(function () {
          var oldurl = 'http://google.com';
          var newurl = 'http://yahoo.com';

$('a[href="http://google.com"]').attr('href', 'http://yahoo.com');
          
          //$('a[href="' + oldurl + '"').attr('href', newurl);
          
          // it's not working too...
          //$('.mylink').attr('href', newurl);
        });