How to block js file reconnection?

Question

JavaScript

Hello.
I have been struggling with the following problem for a long time:
There is a main page with a menu, ajax other pages are loaded into it.
Each loaded page has its own script file.
If I go to the page once, then everything is fine.
If you go to another page and return, the script file will be loaded again and it will turn out that it is duplicated, and when you perform some action on the page, it is executed 2 times. How to determine that this script file has already been loaded and it is unnecessary to load it again?

Answer 1

you need webpack and include this file as a module