JSFiddle - React, Tailwind, and code Playground

by velmurugansp

HTML

<h1>
Second: <span id="sec"></span>
</h1>

JavaScript

function updateTime(){
  var now = new Date(),
      sec = now.getSeconds(),
      secEle = document.getElementById('sec');
  //if sec <= 9
  secEle.innerText = sec;
}

updateTime();

setInterval(updateTime, 1000);