函数CollectionReference.add()要求其第一个参数的类型为object，但它的类型是: undefined

const db = firebase.firestore();
const collectionRef = db.collection('users');

// 确保 data 是一个对象
const data = { name: 'John Doe', age: 30 };

collectionRef.add(data)
  .then((docRef) => {
    console.log('Document written with ID: ', docRef.id);
  })
  .catch((error) => {
    console.error('Error adding document: ', error);
  });

console.log(data); // 确保 data 不是 undefined
collectionRef.add(data)
  .then((docRef) => {
    console.log('Document written with ID: ', docRef.id);
  })
  .catch((error) => {
    console.error('Error adding document: ', error);
  });

collectionRef.add(data)
  .then((docRef) => {
    console.log('Document written with ID: ', docRef.id);
  })
  .catch((error) => {
    console.error('Error adding document: ', error);
    // 进一步处理错误
  });