function CountDown() { var count = 4, tmID, infobox = document.getElementById("start"), suc = document.getElementById("suc"),fin = document.getElementById("fin"); function countDown() { if (--count == 0) { infobox.innerHTML = "時間切れ"; suc.removeEventListener("click", stopCountDown, false); } else { fin.innerHTML = count + "秒前"; tmID = setTimeout(countDown, 1000); } } function startCountDown() { tmID = setTimeout(countDown, 1000); infobox.removeEventListener("click", startCountDown, false); infobox.addEventListener("click", stopCountDown, false); } function stopCountDown() { if (count >= 0){ clearTimeout(tmID); infobox.innerHTML = "成功"; } fin.innerHTML = "終了"; suc.innerHTML = "正解"; suc.removeEventListener("click", stopCountDown, false); } infobox.addEventListener("click", startCountDown, false); }; document.addEventListener("DOMContentLoaded", CountDown, false);