link html to js file code example
Example 1: import script html
<html>
<head>
<script type="text/javascript" src="/path/to/script.js"></script>
...Example 2: include javascript in html
<script>
// JS Here
</script><html>
<head>
<script type="text/javascript" src="/path/to/script.js"></script>
...<script>
// JS Here
</script>