写一个乱序函数

[Saikikoko]

function shufftle(a) {
  for (let i = 1; i < a.length; i++) {
    let j = Math.floor(Math.random() * i);
    [a[i], a[j]] = [a[j], a[i]]
  }
  return a
}

var times = 100000;
var res = {};

for (var i = 0; i < times; i++) {
    var arr = shuffle([1, 2, 3]);

    var key = JSON.stringify(arr);
    res[key] ? res[key]++ :  res[key] = 1;
}

// 为了方便展示，转换成百分比
for (var key in res) {
    res[key] = res[key] / times * 100 + '%'
}

console.log(res)