JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="change">link1</a>
<a href="#" class="change">link2</a>
<a href="#" class="change">link2</a>

JavaScript

var yhn = 'vk.com';
var hn = window.location.hostname;
var url = window.location.href;
var link = url.replace(hn,yhn);
var i = 0;
while (document.getElementsByClassName('change')[i]) {
    document.getElementsByClassName('change')[i].setAttribute('href',link);
    i++;
}