md/js/dom抽奖排列.js

// 生成数组, 从大到小顺时针螺旋
function generateSpiralArray(rows, cols) {
    let arr = Array.from({ length: rows }, () => Array.from({ length: cols }));
    let value = 1;
    let top = 0, bottom = rows - 1, left = 0, right = cols - 1;

    while (top <= bottom && left <= right) {
        // 左 => 右
        for (let i = left; i <= right; i++) {
            arr[top][i] = value++;
        }
        top++;
        // 上 => 下
        for (let i = top; i <= bottom; i++) {
            arr[i][right] = value++;
        }
        right--;

        // 右 => 左
        if (top <= bottom) {
            for (let i = right; i >= left; i--) {
                arr[bottom][i] = value++;
            }
            bottom--;
        }

        // 下 => 上
        if (left <= right) {
            for (let i = bottom; i >= top; i--) {
                arr[i][left] = value++;
            }
            left++;
        }

    }

    return arr;
}

const result2 = generateSpiralArray(6, 6);