Javascript Timer

timer.js

var s=0;
var m=0;
var h=0;

setInterval(function(){elecTimerHandler()},1000);

function elecTimerHandler(){
    s++;
    if (s>59){
        s = 0;
        m++;
    }
    if (m>59){
        m = 0;
        h++;
    }
    if(h>23){
        h=0;
    }
    console.log(lengthHandler(h) + ':' + lengthHandler(m) + ':' + lengthHandler(s));
    return;
}

function lengthHandler(nom){
    if (nom < 10){
        nom = '0' + nom;
    }
    
    return nom;
}