Reaction-Timer/script.js at master · SahajRohilla/Reaction-Timer · GitHub

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

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

               // alert(x);
                function makeShapeAppear(){

                    var top = Math.random() * 400;
                    var left = Math.random() * 400;
                    var width = (Math.random() * 300)+100;
                    var height = Math.random() * 400;
                    if(Math.random() > 0.5){
                        document.getElementById("shape").style.borderRadius = "50%";
                    }else{
                        document.getElementById("shape").style.borderRadius = "0";
                    }
                    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.backgroundColor= getRandomColor();

                    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();

                    var timeTaken = (end- start)/ 1000;

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


                    var minTime = minimumTime(timeTaken);

                    document.getElementById("minTime").innerHTML = minTime +"s";
                    appearAfterDelay();

                }
                var initialMinTime = 1;
                function minimumTime(timeTaken)
                {

                    if(timeTaken < initialMinTime){
                        initialMinTime = timeTaken;
                        return timeTaken;
                    }
                    else{
                    return Math.min(timeTaken,initialMinTime);

                    }
                }