JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

var bar = $('.bar'),
	val = parseFloat(bar.text()),
  timerId;


$('.foo')
	.on('mousedown', function timer() {
  	timerId = setTimeout(function() {
      val += 5;
      bar.text(val);
      timer();
    }, 600);
  })
  .on('mouseup', function() {
  	clearTimeout(timerId);
  });