# IIFE=>Immediately Invoked Function Expression=>khởi tạo function & chạy ngay, import, export như nào
index.html
```html
JavaScript Modules
```
file1.js
```javascript
export const greet = (name) => {
return `Hello, ${name}!`;
};
```
file2.js
```javascript
import { greet } from './file1.js';
const aa = (function () {
const message1 = greet('John 2');
return {
message1
}
})();
export default aa;
```
file3.js
```javascript
import { greet } from './file1.js';
import aa from "./file2.js";
const bb = (function () {
const message2 = greet('John 3') + aa.message1;
return {
message2
}
})();
export default bb;
```
app.js
```javascript
import bb from "./file3.js";
console.log(bb.message2)
```
