Reaction_Timer/javaScript.js at master · FaezehYazdani/Reaction_Timer · GitHub

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		// The time that the page is loaded.
		var start = new Date().getTime();

		function getRandomColor() {
  			var letters = '0123456789ABCDEF';
 			 var color = '#';
  			for (var i = 0; i < 6; i++) {
   				 color += letters[Math.floor(Math.random() * 16)];
  			}
  			return color;
		}

		function makeShapeAppear() {

			var top = Math.random() * 200 + 10;

			var left = Math.random() * 200 + 10;

			var width = Math.random() * 200 + 10;

			var height = Math.random() * 200 + 10;

			if (Math.random() > 0.5) {

				document.getElementById("shape").style.borderRadius = "50%";
			} else {

				document.getElementById("shape").style.borderRadius = "0";
			}


			document.getElementById("shape").style.backgroundColor = getRandomColor();

			document.getElementById("shape").style.top = top + "px";

			document.getElementById("shape").style.left = left + "px";

			document.getElementById("shape").style.width = width + "px";

			document.getElementById("shape").style.height = height + "px"


			document.getElementById("shape").style.display = "block";

			start = new Date().getTime();

		}

		function appearAfterDelay(){

			setTimeout(makeShapeAppear, Math.random() * 2000);

		}

		appearAfterDelay();

		document.getElementById("shape").onclick = function(){

			document.getElementById("shape").style.display = "none"

			var end = new Date().getTime();

			//to convert the milisecond to second.
			var timeTaken = (end - start) / 1000;

			document.getElementById("timer").innerHTML = timeTaken + "s"

			appearAfterDelay();
		}