How to generate random numbers btwn -1 and 1 in js ?

Question

I'm trying to generate random number between -1 and 1.

Answer 1

// integer
n = (Math.floor(Math.random() * 3)) - 1;

// float
n = (Math.random() * 2) - 1;

Answer 2

Johann Ditrich plz explain
by the way thanx

Answer 3

Donna thanx