shuffle.js

shuffle.js

function shuffle(arr) {
    var i = arr.length; 
    var random; 
    var temp;

    while (i > 0) {
        random = Math.floor(Math.random() * i--);

        temp = arr[i];
        arr[i] = arr[random];
        arr[random] = temp;
    }

    return arr;
}

[reference] https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array