How to add a JavaScript when a user navigates to a webpage

See the code.

index.html

Example: HTML

<!DOCTYPE html>
<html>
<body onpageshow="myFunction()">

<h1>Hello World!</h1>

<script>
function myFunction() {
  alert("Welcome!");
}
</script>

</body>
</html>

Output should be:

Type:	html
Category:	Web Tutorial
Sub Category:	HTML Window Event Attributes
Uploaded by:	Admin