Create Stopwatch.khush.java

Stopwatch.khush.java

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+let [milliseconds,seconds,minutes,hours] = [0,0,0,0];
+let timerRef = document.querySelector('.timerDisplay');
+let int = null;
+
+document.getElementById('startTimer').addEventListener('click', ()=>{
+    if(int!==null){
+        clearInterval(int);
+    }
+    int = setInterval(displayTimer,10);
+});
+
+document.getElementById('pauseTimer').addEventListener('click', ()=>{
+    clearInterval(int);
+});
+
+document.getElementById('resetTimer').addEventListener('click', ()=>{
+    clearInterval(int);
+    [milliseconds,seconds,minutes,hours] = [0,0,0,0];
+    timerRef.innerHTML = '00 : 00 : 00 : 000 ';
+});
+
+function displayTimer(){
+    milliseconds+=10;
+    if(milliseconds == 1000){
+        milliseconds = 0;
+        seconds++;
+        if(seconds == 60){
+            seconds = 0;
+            minutes++;
+            if(minutes == 60){
+                minutes = 0;
+                hours++;
+            }
+        }
+    }
+
+ let h = hours < 10 ? "0" + hours : hours;
+ let m = minutes < 10 ? "0" + minutes : minutes;
+ let s = seconds < 10 ? "0" + seconds : seconds;
+ let ms = milliseconds < 10 ? "00" + milliseconds : milliseconds < 100 ? "0" + milliseconds : milliseconds;
+
+ timerRef.innerHTML = ` ${h} : ${m} : ${s} : ${ms}`;
+}