Is Javascript different on different platforms?

Question

So I was learning code on another website and I got pretty far in it. I saw this one and I don't really recognize some of the code. I see the if and else statements but that's about it.

Answer 1

//if you learnt pure Javascript then world wide same or you might learnt other javascript libraries they are different from each other

Answer 2

Have a look here: https://softwareengineering.stackexchange.com/questions/98886/why-do-we-need-different-js-for-different-browsers

https://stackoverflow.com/questions/20727805/differences-between-browsers

Answer 3

good!