JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<p id="test">1</p>

JavaScript

$(document).ready(function(){
    setInterval(function () {
        var number = parseInt($('#test').text().trim());
        if (number >0) {
            $('#test').html(number+1);
        }
    }, 1000);
});