example of a javascript file outside html
Example 1: include script in html
<script type="text/javascript" src="/path/to/script.js"></script>
Example 2: script src tag in html
<script type="text/javascript"
src="file.js">
</script>
<script type="text/javascript" src="/path/to/script.js"></script>
<script type="text/javascript"
src="file.js">
</script>