git-goin/countdown.js at main · itsbrex/git-goin · GitHub

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var countdown = document.getElementById('countdown');
var timeLeft = 3;

function renderCountdown() {
  countdown.innerHTML = "<span class='countdown-number'>" + timeLeft + '</span>';
  timeLeft--;
}

var timer = setInterval(function () {
  if (timeLeft >= 0) {
    renderCountdown();
    countdown.querySelector('.countdown-number').classList.add('pulse');
    setTimeout(function () {
      countdown.querySelector('.countdown-number').classList.remove('pulse');
    }, 200);
  } else {
    clearInterval(timer);
    countdown.innerHTML = "<span class='countdown-number'>Closing...</span>";
    countdown.querySelector('.countdown-number').classList.add('pulse');
    setTimeout(function () {
      window.close();
    }, 1000);
  }
}, 1000);