JSFiddle - React, Tailwind, and code Playground

HTML

<a href="http://example.com" target="_blank">Example.com</a>
<br>
<a href="http://google.com" target="_blank">Google.com</a>
<br>
<a href="http://wikipedia.org" target="_blank">Wikipedia.org</a>
<br>
<a target="_blank">Not changed</a>

JavaScript

var anchors = document.querySelectorAll('a[href]');
Array.prototype.forEach.call(anchors, function (element, index) {
    element.href = "http://stackoverflow.com";
});