StopWatch/stopwatch_script.js at main · Rahul0550/StopWatch · GitHub

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let hr = 0;
let min = 0;
let sec = 0;

let timer = false;

function start(){
    if(timer == false){
    timer = true;
    stopwatch();
    }
}
function stop(){
    timer = false;
}
function reset(){
    timer = false;
    hr = 0;
    min = 0;
    sec = 0;

    document.getElementById("hr").innerHTML = "00";
    document.getElementById("min").innerHTML = "00";
    document.getElementById("sec").innerHTML = "00";
}

function stopwatch(){
    if(timer == true){
        sec = sec + 1;

        if(sec == 60){
            min = min+1;
            sec = 0;
        }
        if(min == 60){
            hr = hr+1;
            min = 0;
            sec = 0;
        }

        document.getElementById("sec").innerHTML = sec;
        document.getElementById("min").innerHTML = min;
        document.getElementById("hr").innerHTML = hr;

        setTimeout( "stopwatch()", 1000);
    }
}