What happens if Spider-Man meets Batman?

Depends on how big Spider-Man's net is ... if he can catch Batman, he can't get away. ...

However, from a purely theoretical point of view, Spider-Man is highly dependent on the environment, and there must be tall buildings around it to fly, which is an accelerated process.

Batman is different. He has wings. He can fly if he wants, or run if he can't fight.

But Spider-Man's net is aimed at flying guys like Batman. Once entangled, bats can't fly. You can fight if you want.