JSFiddle - React, Tailwind, and code Playground

HTML

<button class="foo">Кнопка</button>
<br><div class="bar">0</div>

JavaScript

var bar = $('.bar');
var timer;

function increment(){
	var val = parseFloat(bar.text());
  val += 5;
  bar.text(val);
}

$('.foo').click(function() {
	timer = setInterval(increment, 1000);
});