[Solved] Button to increment a number on screen

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You have the right idea, but there were a few issues with your code.

Side Note: In programming, it’s pretty much always a good idea to name your variables/functions something meaningful and descriptive.

In the code sample below, I changed the name of your function hey to increment since the purpose of that function is to increment the value of our variable (which I also renamed i).

I also replaced your document.write() with a console.log()

//create a global variable called i
var i = 0

//increment i each time the function is called
function increment() {
  i = ++i;
  console.log(i);
}
<!DOCTYPE html>
<html>

<body>
  <button onclick="increment()">Increment</button>
  <script>
  </script>
</body>

</html>

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solved Button to increment a number on screen