方法一:
let x = [1, 2, 3, 4, 5];
function shuffle(arr) {
var length = arr.length,
randomIndex,
temp;
while (length) {
randomIndex = Math.floor(Math.random() * (length--));
temp = arr[randomIndex];
arr[randomIndex] = arr[length];
arr[length] = temp
}
return arr;
}
console.log(shuffle(x))
結果:
[5, 3, 2, 1, 4]
方法二:
var a = [1,4,2,4,3,6]
const shuffle = (arr) => {
for (let i = 0; i < arr.length; i++) {
const randomIndex = Math.round(Math.random() * (arr.length - 1 - i)) + i;
[arr[i], arr[randomIndex]] = [arr[randomIndex], arr[i]]
}
return arr
};
console.log(shuffle(a))
結果:
[2, 6, 4, 3, 4, 1]
方法三:
var a = [1, 2, 3, 4, 5];
a.sort(randomSort);
console.log(a);
function randomSort(a, b) { return Math.random() > 0.5 ? -1 : 1; }
[2, 5, 3, 4, 1]