include javascript file in js code example

Example 1: include js in html

<html>
    <head>        
    </head>
    <body>
    
        <script type="text/javascript" src=es4.js></script>
           
    </body>
        
</html>

Example 2: include other js files in a js file

document.writeln("<script type='text/javascript' src='Script1.js'></script>");
document.writeln("<script type='text/javascript' src='Script2.js'></script>");

Example 3: javascript using another js file

// module.js
export function hello() {
  return "Hello";
}

// main.js
import {hello} from 'module'; // or './module'
let val = hello(); // val is "Hello";