time online

var hh = 0;
var mm = 0;
var ss = 0;
var start = false;
var timerInterval = null;

function startTimer() {
  if (start === false) {
    start = true;
    timerInterval = setInterval(function() {
      ss++;
      if (ss === 60) {
        mm++;
        ss = 0;
      }
      if (mm === 60) {
        hh++;
        mm = 0;
      }
      var newTime = (hh < 10 ? '0' + hh : hh) + ':' + (mm < 10 ? '0' + mm : mm) + ':' + (ss < 10 ? '0' + ss : ss);
      document.querySelector('.timer').innerHTML = newTime;
    }, 1000);
  }
}
function stopTimer() {
  if (start === true) {
    start = false;
    clearInterval(timerInterval);
  }
}
function resetTimer() {
  stopTimer();
  hh