JavaScript: what does i++ or x++ mean

Question

I see i++ and x++ on JavaScript code and I don't really see what it is doing.
(Is it like "class" in html?) or what?'

Answer 1

x++ is the short form of „x += 1“. It means that x is becomes judt one more, x + 1 ;) That‘s very simple

Answer 2

x++ and i++ means x = x+1 and
i = i + 1 or simply i += 1 and
x +=1.

Answer 3

It's post increment. You can find more info in JS course https://www.sololearn.com/learn/JavaScript/1130/