这是另一种使用 reduce()生成了相应列的总数.

This is another approach that uses map() over the first array, nested with a reduce() that generated the total of the corresponding column.

const list = [
  [2, 9, 1, 2],
  [2, 3, 9, 4],
  [4, 7, 8, 1]
];

const sums = list[0].map((x, idx) => list.reduce((sum, curr) => sum + curr[idx], 0));

console.log(sums);

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