How to call function in web

Question

HTML
<div id="box" onclick=a()></div>
JS
window.onload = function() {
function a(){ }
}
It make Error

Answer 1

SorryPark

If you are calling function from html elements then no need to write inside window.onload because function will call when you click.

also function should be inside single quotes or double quotes in html elements.

there should be onclick = 'a()'