JSFiddle - React, Tailwind, and code Playground

HTML

<div class="switch">
</div>

JavaScript

var timer;

function tick(var left) { alert(left);
    if (left != 0) {
      var time='0' + parseInt(left/60) + ':' + (left - parseInt(left/60) * 60);
      $('.switch').html(time);
      left--;
      timer = setTimeout(tick(left), 1000);
    }
};

var sec = 50000;
tick(sec);