var startTime;function getRandomColor() {  var letters = '0123456789ABCDEF';  var color = '#';  for (var i = 0; i < 6; i++) {    color = color + letters[Math.floor(Math.random() * 16)];  }  return color;}function makeShapeAppear() {  var top = Math.random() * 400;  var left = Math.random() * 400;  var width = (Math.random() * 200) + 100;  document.getElementById("shape").style.width = width + "px";  document.getElementById("shape").style.height = width + "px";  document.getElementById("shape").style.top = top + "px";  document.getElementById("shape").style.left = left + "px";  document.getElementById("shape").style.display = "block";  if (Math.random() > 0.5) {    document.getElementById("shape").style.borderRadius = "50%";  } else {    document.getElementById("shape").style.borderRadius = "0%";  }  document.getElementById("shape").style.backgroundColor = getRandomColor();  startTime = new Date().getTime();}function shapeAfterDelay() {  setTimeout(makeShapeAppear, (Math.random() * 2000));}shapeAfterDelay();document.getElementById("shape").addEventListener("click", function(js) {  document.getElementById("shape").style.display = "none";  var endTime = new Date().getTime();  var timeTaken = ((endTime - startTime) / 1000);  document.getElementById("timeTaken").innerHTML = timeTaken;  shapeAfterDelay();});我用 Javascript 制作了一個游戲，其中用戶單擊形狀，瀏覽器顯示他單擊該形狀所花費的時間?，F在我還想確定用戶在所有點擊中花費的最少時間，但無法弄清楚如何做到這一點。