从数组创建哈希的最简洁方法

const arr = [['a', 1], ['b', 2], ['c', 3]];

const hash = arr.reduce((acc, [key, value]) => {
  acc[key] = value;
  return acc;
}, {});

console.log(hash); // 输出：{ a: 1, b: 2, c: 3 }