如何使用sdk v3检查cosmos DB中是否存在自定义项？

const { CosmosClient } = require("@azure/cosmos");

async function checkCustomItemExists() {
  const endpoint = "<Cosmos DB endpoint>";
  const key = "<Cosmos DB key>";
  const databaseId = "<database ID>";
  const containerId = "<container ID>";
  const itemId = "<custom item ID>";
  const partitionKey = "<partition key>"; // 如果有分区键

  const client = new CosmosClient({ endpoint, key });
  const database = client.database(databaseId);
  const container = database.container(containerId);

  try {
    const { resource: item } = await container.item(itemId, partitionKey).read();
    console.log("自定义项存在:", item);
  } catch (error) {
    if (error.code === 404) {
      console.log("自定义项不存在");
    } else {
      console.error("检查自定义项时出错:", error);
    }
  }
}

checkCustomItemExists().catch((error) => {
  console.error("发生错误:", error);
});