how to link a JS file to HTML file 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 link your js file to html
<script src="index.js"></script>
Example 4: link javascript file to html
<script type="text/javascript" src="path-to-javascript-file.js"></script>