(() => {
      function CountDown() {
        var count = 4, tmID, infobox = document.getElementById("start");
        function countDown() {
    if (--count == 0) {
    	    infobox.innerHTML = "失敗";
    	} else {
    	    infobox.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() {
            clearTimeout(tmID);
            infobox.innerHTML = "成功!!";
            infobox.setAttribute("class", "success");
        }
        infobox.addEventListener("click", startCountDown, false);
      }
      document.addEventListener("DOMContentLoaded", CountDown, false);
    })();