LukeHan 의 잡다한 기술 블로그

function startTimer(duration, display){ var timer = duration, seconds; var interval = setInterval(function(){ seconds = parseInt(timer % 60, 10); seconds = seconds < 10 ? "0" + seconds : seconds; display.textContent = seconds; if(timer === 0){ clearInterval(interval); } if(--timer < 0){ timer = duration; } }, 1000); } startTimer(60, document.querySelector('#timeCount'));