js随机数[0,100]与[0,100)

1. [0,100)

   Math.floor(Math.random() * 100);//产生0~99.999...的随机数，并向下取整

2.[0,100] Math.floor(Math.random() * 101);//产生0~100.999...的随机数，并向下取整

3.[n,m] Math.floor(Math.random() * (m - n + 1)) + n;

4.[n,m) Math.floor(Math.random() * (m-n)) + n;