JAVASCRIPT

javascript include js file

function loadScript( url, callback ) {
  var script = document.createElement( "script" )
  	  script.type = "text/javascript";
      script.src = url;
 	  script.onload = function() {
     	callback()
      };
     document.head.appendChild(script); 
}
// call the function...
loadScript("js/myscript.js", function() {
  alert('script ready!'); 
});

include js to js

var imported = document.createElement('script');
imported.src = '/path/to/imported/script';
document.head.appendChild(imported);

include js to js

<script type="module">
  import { hello } from './hello.mjs'; // Or it could be simply `hello.js`
  hello('world');
</script>

// hello.mjs -- or it could be simply `hello.js`
export function hello(text) {
  const div = document.createElement('div');
  div.textContent = `Hello ${text}`;
  document.body.appendChild(div);
}