How to find out that the user entered the iframe application from a mobile application?

Question

JavaScript

Not from the browser, but from the application. And also to distinguish iPhones from Androids

Answer 1

Pass some variable in the application, well, muti the is_app () function

Answer 2

window.self !== window.top
Checks what is launched from the iframe of the browser (in the mobile application, the launch goes through the built-in browser from the OS, this is not an iframe)