Returns a slightly reandomized version os an array.

shuffle.js

(function() {
    'use strict';

    function shuffle(array) {
        array.sort(function() {
            return Math.floor( Math.random() * 3) -1;
        });
        return array;
    }

    var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
    console.log( shuffle(arr) );
})();

The trick here is use Array.sort() method with a function that returns a random sort index (-1 | 0 | 1), so the array elements will be randomly swapped back or forward.

You can call it several times to generate more entropy:

console.log( shuffle( shuffle( shuffle( shuffle( arr )))) );