JAVASCRIPT

import js file into another

export function greet(name) {
  return `Hello, ${name}`;
}

export const message = "How you doing?";

///

import { greet, message } from "./utils.js";

const greet_scaler = greet("Scaler");

console.log(greet_scaler); // Hello, Scaler
console.log(message); // How you doing?

javascript include a js file from another

// jQuery
$.getScript('/path/to/imported/script.js', function()
{
    // script is now loaded and executed.
    // put your dependent JS here.
});