var REFRESH_PERIOD_SECOND = 30;

​

var timer;

var counter = 0;

​

function startTimer() {

  console.log('start timer');

  timer = setInterval(function () {

    counter += 1;

    console.log(counter);

    if (counter >= REFRESH_PERIOD_SECOND) {

        // do something..

      resetTimer();

    } 

  }, 1000);

}

​

function resetTimer() {

  console.log('reset timer');

  stopTimer();

  startTimer();

}

​

function stopTimer() {

  console.log('stop timer');

  clearInterval(timer);

  counter = 0;

}

​

startTimer();

​