如何使用Typescript从Firestore中的特定文档中获取文档字段？

import firebase from 'firebase/app';
import 'firebase/firestore';

const firebaseConfig = {
  // Firebase配置信息
};

firebase.initializeApp(firebaseConfig);
const firestore = firebase.firestore();

async function getDocumentField(documentId: string, fieldName: string): Promise<any> {
  try {
    const documentRef = firestore.collection('collectionName').doc(documentId);
    const documentSnapshot = await documentRef.get();

    if (documentSnapshot.exists) {
      const documentData = documentSnapshot.data();
      return documentData[fieldName];
    } else {
      throw new Error('Document does not exist');
    }
  } catch (error) {
    console.error('Error getting document field:', error);
    throw error;
  }
}

const documentId = 'yourDocumentId';
const fieldName = 'yourFieldName';

getDocumentField(documentId, fieldName)
  .then((fieldValue) => {
    console.log('Field value:', fieldValue);
  })
  .catch((error) => {
    console.error('Error:', error);
  });