随机数组

写个方法随机打乱一个数组？

const shuffle = (arr) => {
  const result = arr.slice();
  for (let i = 0; i < result.length; i++) {
    const randomIndex = Math.floor(Math.random() * result.length);
    [result[i], result[randomIndex]] = [result[randomIndex], result[i]];
  }
  return result;
};