Button help

Question

HTML:
<button type=“button” id=“BtnA” onclick=“?()”
CSS:
#BtnA {
‘Style’
}
JS:
function ?() {
var a = “Hello”;
document.getElementById(“001”).innerHTML = a(
}

-end-

How can i make the button execute the code?

Answer 1

<!--I think you need to put on a real id, that's the code that I remade! you can see it :) -->
<button type = "button" id = "BtnA" onclick = "Func()"> click </button>
<script>
function Func() {
var a = "Hello";
document.getElementById ("BtnA"). innerHTML = a;
}
</script>

Answer 2

getElementById("BtnA")

Answer 3

yeah that's true. the ID is accessible for both CSS and JS and the ID must exist for use even in JS