Why doesn't this code work? (Am I making and obvious mistake)?

Question

Here is my code:

var num = 0;
function upNum() {
num++;
document.getElementById("count").innerHTML = num;
}
function countms() {
var time = 0;
time++;
return time;
}

if(num === 10000) {
clearInterval(count);
document.getElementById("count").innerHTML = "Your still here?";
if(setInterval(countms, 1) === 5000) {
setInterval(upNum, 1);
}
}

var count = setInterval(upNum,1);

Please let me know if you find a error in my code.

Answer 1

if (setInterval(countms, 1) === 5000 ) ===> setInterval return interval_id. You never know when that's going to be 5000. Also everytime you call countms, it will always return 1