//考試題答案全排列組合function getAllArrange(arr, index, group) {index || (index = 0), group || (group = []);var temp = arr[index], len = group.length;group.push(temp);for (var i = 0; i < len; i++) {group.push(group[i] + temp);}return ++index >= arr.length ? group : getAllArrange(arr, index, group);}console.log(getAllArrange(["A", "B", "C", "D"]));//輸出["A", "B", "AB", "C", "AC", "BC", "ABC", "D", "AD", "BD", "ABD", "CD", "ACD", "BCD", "ABCD"]

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