JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    Нас зарегистрировалось: <span id="my__counter"></span>
</div>

JavaScript

var speed = 1;



function goCounter(){
    var timestamp = Math.round(new Date().getTime() / 1000),
        counter = Math.ceil(timestamp * speed),
        interval = Math.floor(Math.random() * (4000 - 1000 + 1)) + 400;
    
    $('#my__counter').text(counter);
    setTimeout(function(){ goCounter(); }, interval);
}


goCounter();