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