javascript - In addition to judging UA, is there any other way to judge whether the request comes from mobile or PC?

Question

UA is too easy to be forged. I would like to ask if there are other methods that are not easy to forge to determine whether the request comes from PC or mobile

I temporarily want to (check) a way to judge whether it is triggered based on the window.ontouchstart method, but it seems to be easy to be faked?

Answer 1

Determine screen size?

Answer 2

Just judge based on the UA. If the mobile terminal forges the UA of the PC, it means that the user wants to access the PC page

Answer 3

If you have your own app, you can request your own client interface, or you can judge