how to use a js file in html code example
Example 1: calling javascript file in html
<script type="text/javascript" src="yourfile.js"></script>
Example 2: how to add script in html head
<script src="script.js" defer></script>
<!--just add defer attribute so script will execute at last-->
Example 3: how to connect a javascript file to html
<script src="name.js">
//put in your javascript here
</script>