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 function getNum() {
            var D1, N1, N2, N3;
            var arr = [3];
            for (var i = 0; i <= 9; i++) {
                D1 = i;
                arr[0] = D1;
                for (var j = 0; j <= 9; j++) {
                    if (j == i)
                        continue;
                    N1 = j;
                    arr[1] = N1;
                    for (var k = 0; k <= 9; k++) {
                        if (k == i || k == j)
                            continue;
                        N2 = k;
                        arr[2] = N2;
                        for (var l = 0; l <= 9; l++) {
                            if (l == i || l == j || l == k)
                                continue;
                            N3 = l;
                            arr[3] = N3;
                           document.write(arr.toString());
                           document.write('</br>');

                        }
                    }
                }
            }


        }

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תÔØÓÚ:https://www.cnblogs.com/wusong/p/4501962.html