var arr = [];
for (var i = 1; i < 27; i++) {//生成壹個1-26的數組
arr[i - 1] = i;
}
for (var r = 0; r < 26; r++) {//生成壹個0-(25-r)的隨機索引,
var t = arr[25 - r];
arr[25 - r] = arr[Math.floor(Math.random() * (26 - r))];
arr[Math.floor(Math.random() * (26 - r))] = t;
}
}