How do I set the text in a h1/text/marquee to a javascript variable?

Question

I have been trying to make a simple clicker game and I dont think there should be a popup every time..

Answer 1

I don't really get what you mean but hopefully this helps you
<h1>click me</h1>
<script>
var a=document.getElementsByTagName("h1")[0];
a.addEventListener("click",function(){
alert("you won");
})
</script>

Answer 2

I want to make it so that if you click a button, instead of showing a pop up with your number and no way to memorize it, I want to change the H1 text to a JS variable. For example, you click the button and the number of clicks shows in a pop up. But I want it to show in a H1 with it changing every time it is updated.