Write a JS function that has an n (numeric type) whose return value is an array of n random and non-repeating integers, and the integer value range is [2,32]

Today in the public number to see this problem, I wrote down, found himself still have a lot of unnoticed, in this record,

Returns a random integer function getrandom (min, max) {var rand = Math.Round (Math.random () * (max-min) + min); return rand;}; repeatability validation function isrepeat (arr,n) {if (Arr.indexof (n) >-1) {return true;}; return false;}; function fn (n) {var arr = [],max = 32,min = 2;//is the verification of the numbers var isnum =!isnan (number (n));//Whether it is legally validated var Randok = (n >= 1 && N <= (max-min + 1))? True:false; if (isnum && Randok) {for (var i = 0; i < n; i++) {var rand = Getrandom (Min,max); if (Isrepeat (Arr,rand)) {i -- ; }else{Arr.push (rand);}} } return arr; }; Console.log (FN (31)) encountered several problems in this process, about the function take the integer problem to do the collation.

1.math.random (); The result is a random number between 0-1 (including 0, excluding 1)
2.math.floor (num); The parameter num is a numeric value and the function result is the integer portion of Num.
3.math.round (num); The parameter num is a numeric value and the function result is the integer after num is rounded.

Math: A Mathematical object that provides a mathematical calculation of the data.
Math.random (); Returns a random number between 0 and 1 (including 0, excluding 1).

Math.ceil (n); Returns the smallest integer greater than or equal to N.
With Math.ceil (Math.random () *10), a random integer of 1 to 10 is obtained, with a minimum probability of 0 being taken.

Math.Round (n); Returns the value of an integer after n rounding.
With Math.Round (Math.random ()), a random integer from 0 to 1 can be obtained evenly.
With Math.Round (Math.random () *10), a basic equalization can be obtained for random integers from 0 to 10, where the probability of obtaining a minimum of 0 and a maximum of 10 is less than half.

Math.floor (n); Returns the largest integer less than or equal to N.
With Math.floor (Math.random () *10), a random integer from 0 to 9 can be obtained evenly.

Write a JS function that has an n (numeric type) whose return value is an array of n random and non-repeating integers, and the integer value range is [2,32]