[Vlasenko Fedor]

function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex;
  while (0 !== currentIndex) {
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
}
alert(shuffle([1,2,3,4,5,6,7,8,9]));

описание метода
https://en.wikipedia.org/wiki/Fisher...3Yates_shuffle
Fisher–Yates Shuffle Visualization