Cronometro/script.js at main · LeonardoSantosBR/Cronometro · GitHub

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let seconds= 0;
let minutes= 0;
let hours= 0;
let countdown;

function start(){
    countdown= setInterval(()=>{
        timer();
    },1000)
}

function pause(){
   clearInterval(countdown);
}

function stop(){
   clearInterval(countdown);
   seconds= 0;
   minutes= 0;
   hours= 0;
   document.getElementById("countdown-area").innerHTML= `00:00:00`
}
function timer(){
    seconds ++;
    if(seconds==60){
        seconds= 0;
        minutes ++;
    }
    if(minutes == 60){
        minutes= 0;
        hours++;
    }

    let format=
    (hours <10 ? '0'+hours:hours)+
    ":"+
    (minutes <10 ? '0'+minutes:minutes)+
    ":"+
    (seconds <10 ? '0'+seconds:seconds)

    document.getElementById("countdown-area").innerHTML= format;

}