JSFiddle - React, Tailwind, and code Playground

by coiscir

HTML

<span>0:10</span>

JavaScript

var interval = setInterval(function() {
    var timer = $('span').html();
    timer = timer.split(':');
    var minutes = parseInt(timer[0], 10);
    var seconds = parseInt(timer[1], 10);
    seconds -= 1;
    if (minutes < 0) return clearInterval(interval);
    if (minutes < 10 && minutes.length != 2) minutes = '0' + minutes;
    if (seconds < 0 && minutes != 0) {
        minutes -= 1;
        seconds = 59;
    }
    else if (seconds < 10 && length.seconds != 2) seconds = '0' + seconds;
    $('span').html(minutes + ':' + seconds);
    
    if (minutes == 0 && seconds == 0)
        clearInterval(interval);
}, 1000);