Button counting JS game development

Question

So I'm trying to make a button in JS/Html, where there's an alert everytime I click on it. It should show the number increment from 0 to any number, like this:
1st click = 1
2nd click = 2
3rd click = 3
and so on

How do I make this happen?
My code so far was this one, but it always showed 1 when I clicked on it, nothing else:
window.onload = function jump (){
let btn =
document.getElementById("jump");
let count = 0;
btn.onclick = jump;
count += 1
alert (count)
};
the "jump" ID is the button ID btw

Answer 1

Thats because in your function you are starting again the variable count to 0. Leave count out on the global scoope.

Answer 2

Yeah I got it now, I changed it to this :

window.onload = function jump (){
let btn =
document.getElementById("jump");
count = 0;
btn.onclick = function(){
count += 1;
alert (count)
};
};