js & array & shuffle
const list = [1, 2, 3, 4, 5, 6, 7, 8, 9];
list.sort(() => Math.random() - 0.5)
(9) [2, 6, 8, 1, 7, 5, 9, 3, 4]
list.sort(() => Math.random() - 0.5)
(9) [8, 1, 3, 4, 9, 7, 6, 2, 5]
list.sort(() => Math.random() - 0.5)
(9) [9, 8, 5, 7, 6, 1, 3, 2, 4]
list.sort(() => Math.random() - 0.5)
(9) [1, 5, 7, 8, 6, 9, 2, 4, 3]
Array.sort()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
shuffle 洗牌算法
https://zzk.cnblogs.com/my/s/blogpost-p?Keywords=shuffle
https://www.cnblogs.com/xgqfrms/p/11977189.html
function shuffle(arr) {
let m = arr.length;
while (m > 1){
let index = Math.floor(Math.random() * m--);
[arr[m] , arr[index]] = [arr[index] , arr[m]]
}
return arr;
}
refs
https://flaviocopes.com/how-to-shuffle-array-javascript/
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