JavaScript 数组全排列算法：输出子数组结果

const permute = (arr) => arr.length === 1 ? [arr] : arr.flatMap((val, i) => {\n const subPermutations = permute([...arr.slice(0, i), ...arr.slice(i + 1)]);\n return subPermutations.map((perm) => [val, ...perm, ...subPermutations]);\n});