JS gets a set of non-repeating random number methods

First, the basic idea:

Create an array, one at a time, and put it in a new array.

Second, the realization method

1. Method One:

(1) Create an array of arr, an array of elements for all possible occurrences of the set of elements;

(2) Get the random number by Num=math.floor (Math.random () *num_total*first_value) method.

The range of random numbers is 0-arr.length;

(3) get an array of elements of that position by push[num];

(4) Delete the element by Arr.splice (num,1) ;

The complete wording is:

function Roa (AR) {    var arr=ar;     var temp=new  Array ();      for (i=0;i<count;i++)    {         var num=math.floor (Math.random () *original.length);         Temp.push (Arr[num]);        Arr.splice (num,1);    }     return temp;}

JS gets a set of non-repeating random number methods