how to use js file in html code example
Example 1: include js in html
<html>
<head>
</head>
<body>
<script type="text/javascript" src=es4.js></script>
</body>
</html>
Example 2: calling javascript file in html
<script type="text/javascript" src="yourfile.js"></script>
Example 3: how to add script in html head
<script src="script.js" defer></script>
Example 4: link javascript to html
<script src="index.js"> </script>
Example 5: How to add js file to a site through url
var jsFile = document.createElement("script");
jsFile.src = "homePage.js"; // it can be path also "{themes('/scripts/homePage.js')}"
document.body.appendChild(jsFile); //append it as src to body