Why doesn't javascript from external files work on iPad?

Question

JavaScript

On the site, the file with scripts is connected in the standard way via script src=""
I found out that the iPad simply does not see the scripts from this file, I checked it on Safari and Chrome. The problem is browser independent.
On desktop and phone (android) there are no problems.
If the script from the file is placed in the body of the page, then it works.
iOS version 9.2.1
What is the problem and how can I fight?

Answer 1

Что бы все работала на айпаде , в начале js файла включите строгий режим -> пропишите в первой строке -> use strict << , далее открываете на компе сайт и консоль и исправляете.