用javascript生成回型矩阵 蛇形矩阵

function Annular(n) {
    n = parseInt(n);
    var divisor = [];
    for (var i = 1; i <= n; i++) {
        if (n % i == 0) {
            divisor.push(i);
        }
    }
    var len = divisor.length;
    if (len % 2 == 0) {
        var mid = len / 2;
        var row = divisor[mid - 1];
        var col = divisor[mid];
    } else {
        var row = divisor[Math.floor(len / 2)];
        var col = row;
    }
    //console.log("行：" + row + "  列：" + col);
    var arr = new Array(row)
    for (var j = 0; j < arr.length; j++) {
        arr[j] = new Array(col)
    }
    var quan = Math.ceil(row / 2);
    var begin = 1;
    var q = 0;
    while (q < quan) {
        var top = col - q * 2;
        for (var i = 0; i < top; i++) {
            arr[q][i + q] = begin + i;
        }
        var right = row - q * 2;
        for (var i = 0; i < right; i++) {
            arr[i + q][col - 1 - q] = begin + top - 1 + i;
        }
        var bottom = col - q * 2;
        for (var i = 0; i < bottom; i++) {
            arr[row - 1 - q][bottom - i - 1 + q] = begin + top - 1 + right - 1 + i;
        }
        var left = row - q * 2 - 1;
        for (var i = 0; i < left; i++) {
            arr[row - 1 - q - i][q] = begin + top - 1 + right - 1 + bottom - 1 + i;
        }
        var stop = begin + top + right + bottom + left - 4;
        begin = stop + 1;
        q++;
    }
    console.log(arr);
}

Annular(25);

//输出

[ [ 1, 2, 3, 4, 5 ],
  [ 16, 17, 18, 19, 6 ],
  [ 15, 24, 25, 20, 7 ],
  [ 14, 23, 22, 21, 8 ],
  [ 13, 12, 11, 10, 9 ] ]

Annular(25);

//输出

[ [ 1, 2, 3, 4, 5 ],
  [ 14, 15, 16, 17, 6 ],
  [ 13, 20, 19, 18, 7 ],
  [ 12, 11, 10, 9, 8 ] ]