stopwatchscript.js

let hours = 00;
let minutes = 00;
let seconds = 00;
let milliseconds = 00;
let interval;

const hoursContainer = document.getElementById("hours");
const minutesContainer = document.getElementById("minutes");
const secondsContainer = document.getElementById("seconds");
const millisecondsContainer = document.getElementById("milliseconds");
const start= document.getElementById("start");
const stop= document.getElementById("stop");
const reset= document.getElementById("reset");

const startTimer =() => {
    clearInterval(interval);
    interval = setInterval(startWatch,1);
}

const stopTimer =() => {
    clearInterval(interval);
}

const resetTimer =() => {
    milliseconds=0;
    seconds=0;
    minutes=0;
    hours=0;

    millisecondsContainer.innerHTML = "00";
    secondsContainer.innerHTML = "00";
    minutesContainer.innerHTML = "00";
    hoursContainer.innerHTML = "00"; 
    clearInterval(interval);
}

function startWatch(){
    milliseconds++;
    if(milliseconds < 9){
        millisecondsContainer.innerHTML= `0${milliseconds}`;
    }
    else if(milliseconds > 99){
        seconds++;
        milliseconds=0;
        millisecondsContainer.innerHTML= "00";
        
    }
    else{
        millisecondsContainer.innerHTML = milliseconds;
    }


    if(seconds < 10){
        secondsContainer.innerHTML= `0${seconds}`;
    }
    else if(seconds > 59){
        minutes++;
        seconds=0;
        secondsContainer.innerHTML= "00";
    }
    else{
        secondsContainer.innerHTML = seconds;
    }


    if(minutes < 10){
        minutesContainer.innerHTML= `0${minutes}`;
    }
    else if(minutes > 59){
        hours++;
        minutes=0;
        minutesContainer.innerHTML= minutes;
    }
    else{
        minutesContainer.innerHTML = minutes;
    }

    if(hours < 10){
        hoursContainer.innerHTML= `0${hours}`;
    }
    else{
        hoursContainer.innerHTML = hours;
    }
}

    start.addEventListener("click",startTimer);    
    stop.addEventListener("click",stopTimer);    
    reset.addEventListener("click",resetTimer);    


//Timer