What are modules in JavaScript?

Javascript Web Development Object Oriented Programming

Modules were introduced in ES 2015 to break over code into smaller pieces. The modules could contain classes or functions in them. Keywords export and import are used to export variables, functions, objects and import them in other files.

Note − To run this example you will need to run a localhost server.

Following is the code for modules in JavaScript

INDEX.html

Example

Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 18px;
      font-weight: 500;
      color:blueviolet;
   }
</style>
</head>
<body>
<h1>Modules in JavaScript</h1>
<button class="Btn">IMPORT</button>
<div class="result"></div>
<h3>Click on the above button to import module</h3>
<script src="script.js" type="module"></script>
<script src="sample.js" type="module"></script>
</body>
</html>

script.js

import test from './sample.js';
document.querySelector('.Btn').addEventListener('click',()=>{
   test();
})

sample.js

let resultEle = document.querySelector(".result");
export default function testImport(){
   resultEle.innerHTML = 'Module testImport has been imported';
}