检查多维数组中的匹配键值是否存在于新数组中更新键值，方法是将

function updateArrayValues(existingArray, newArray) {
  for (let i = 0; i < existingArray.length; i++) {
    const subArray = existingArray[i];

    for (let j = 0; j < subArray.length; j++) {
      const keyValue = subArray[j];

      // 检查新数组中是否存在相同的键值
      const newKeyValue = newArray.find(item => item.key === keyValue.key);

      if (newKeyValue) {
        // 更新键值
        subArray[j] = newKeyValue;
      }
    }
  }

  return existingArray;
}

// 示例用法
const existingArray = [
  [{ key: 'a', value: 1 }, { key: 'b', value: 2 }],
  [{ key: 'c', value: 3 }, { key: 'd', value: 4 }],
];
const newArray = [
  { key: 'b', value: 10 },
  { key: 'd', value: 20 },
];

const result = updateArrayValues(existingArray, newArray);
console.log(result);