更改object的深度嵌套属性，但混合了数组

const obj = {
  a: {
    b: {
      c: [1, 2, { d: 3 }]
    }
  }
};

function setNestedValue(obj, keys, value) {
  if (keys.length === 0) {
    return value;
  }
  const [firstKey, ...remainingKeys] = keys;
  obj[firstKey] = setNestedValue(obj[firstKey] || {}, remainingKeys, value);
  return obj;
}

const obj = {
  a: {
    b: {
      c: [1, 2, { d: 3 }]
    }
  }
};

const keys = ['a', 'b', 'c', 2, 'd'];
const newValue = 4;

setNestedValue(obj, keys, newValue);

console.log(obj);

{
  a: {
    b: {
      c: [1, 2, { d: 4 }]
    }
  }
}