如何在Firestore中递增一个数字？

const userRef = db.collection('users').doc('user-id');

db.runTransaction(transaction => {
  return transaction.get(userRef).then(userDoc => {
    if (!userDoc.exists) {
      throw new Error('User document does not exist!');
    }

    const currentScore = userDoc.data().score || 0;
    const newScore = currentScore + 1;

    transaction.update(userRef, { score: newScore });
  });
}).then(() => {
  console.log('Score incremented successfully!');
}).catch(error => {
  console.error('Error incrementing score:', error);
});