how to make js file in html code example

Example 1: import js in html

<script type="text/javascript" src="yourfile.js"></script>

Example 2: include script in html

<script type="text/javascript" src="/path/to/script.js"></script>

Example 3: how to enter javascript in html

<script type="text/javascript">
  alert("This alert box was called with the onload event");
</script>