add js file html code example
Example 1: include script in html
<script type="text/javascript" src="/path/to/script.js"></script>
Example 2: how to link your js file to html
<script src="index.js"></script>
Example 3: calling javascript file in html
<script type="text/javascript" src="yourfile.js"></script>
Example 4: html load js file
<script src="myscripts.js"></script>