deepLearn/permutation.html at master · wangliang1124/deepLearn · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>全排列</title>
</head>

<body>
    <script>
        var permutation = function (string) {
            var arr = string.split('')

            function permute(arr) {
                if (arr.length === 1) {
                    return arr;
                }
                if (arr.length === 2) {
                    return [arr[0] + arr[1], arr[1] + arr[0]];
                }

                let result = []
                for (let index = 0; index < arr.length; index++) {
                    let pivot = arr.splice(index, 1)[0];
                    result = result.concat(permute(arr).map(item => pivot + item))
                    arr.splice(index, 0, pivot)
                }
                return [...new Set(result)];
            }

            return permute(arr)
        };

        let res = permutation('ABCDEFGHA'); // 超过10位内存可能溢出
        console.log(res);

    </script>
</body>

</html>