我通過做我上面所做的一切來解決這個問題，并為云功能使用以下代碼
const functions = require('firebase-functions');
const admin = require("firebase-admin");
admin.initializeApp(functions.config().firebase);
exports.onFollowCreate = functions.firestore
.document("following/{userID}/myFollowing/{id}")
.onCreate((snap, context) => {
const newValue = snap.data()
const db = admin.firestore();
db.collection("users").doc(context.params.userID).update({following: admin.firestore.FieldValue.increment(1)}).catch((er)=>{console.log(er)})
db.collection('followers').doc(newValue.uid).collection("myFollowers").doc(context.params.userID).set({uid: context.params.userID, timeStamp: new Date()}).catch(er=>console.log(er))
});
exports.onFollowDelete = functions.firestore
.document("following/{userID}/myFollowing/{id}")
.onDelete((snap, context)=>{
const deletedValue = snap.data()
const db = admin.firestore();
db.collection("users").doc(context.params.userID).update({following: admin.firestore.FieldValue.increment(-1)}).catch(er=>console.log(er))
db.collection('followers').doc(deletedValue.uid).collection("myFollowers").doc(context.params.userID).delete().catch(er=>console.log(er))
})
exports.onFollowersCreate = functions.firestore
.document("followers/{userID}/myFollowers/{id}")
.onCreate((snap, context)=>{
const db = admin.firestore();
db.collection("users").doc(context.params.userID).update({followers: admin.firestore.FieldValue.increment(1)}).catch(er=>console.log(er))
})
exports.onFollowersDelete = functions.firestore
.document("followers/{userID}/myFollowers/{id}")
.onDelete((snap, context)=>{
const db = admin.firestore();
db.collection("users").doc(context.params.userID).update({followers: admin.firestore.FieldValue.increment(-1)}).catch(er=>console.log(er))
})
