字符洗牌

function shuffle(str) {
  const arr = str.split('');
  for (let i = arr.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [arr[i], arr[j]] = [arr[j], arr[i]];
  }
  return arr.join('');
}

const shuffledStr = shuffle('hello');
console.log(shuffledStr);

import random

def shuffle(str):
    arr = list(str)
    random.shuffle(arr)
    return ''.join(arr)

shuffled_str = shuffle('hello')
print(shuffled_str)