在firebase函数中使用类

Question

我正在为firebase函数编写代码，问题是我需要使用一个类，但当我调用class方法时，firebase函数日志显示以下错误：

错误：

ReferenceError: Proverbi is not defined
at exports.getProverbio.functions.https.onRequest (/srv/index.js:48:26)
at cloudFunction (/srv/node_modules/firebase-functions/lib/providers/https.js:49:16)
at /worker/worker.js:783:7
at /worker/worker.js:766:11
at _combinedTickCallback (internal/process/next_tick.js:132:7)
at process._tickDomainCallback (internal/process/next_tick.js:219:9)

这是"index.js"代码：

//firebase deploy --only functions
// The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
const functions = require('firebase-functions');
// The Firebase Admin SDK to access the Firebase Realtime Database.
const admin = require('firebase-admin');
admin.initializeApp();
// Take the text parameter passed to this HTTP endpoint and insert it into the
// Realtime Database under the path /messages/:pushId/original
exports.addStanza = functions.https.onRequest(async (req, res) => {
// Grab the text parameter.
const nome = req.query.text;
// Push the new message into the Realtime Database using the Firebase Admin SDK.
const snapshot = await admin.database().ref('/stanze').push({giocatori: {giocatore:{nome:nome,punteggio:0}}});
// Redirect with 303 SEE OTHER to the URL of the pushed object in the Firebase console.
//res.redirect(200, nome.toString());
var link = snapshot.toString().split('/');
res.json({idStanza:link[4]});
});
// Listens for new messages added to /messages/:pushId/original and creates an
//  uppercase version of the message to /messages/:pushId/uppercase
exports.addFirstPlayer = functions.database.ref('/stanze/{pushId}/giocatori/giocatore/nome')
.onCreate((snapshot, context) => {
// Grab the current value of what was written to the Realtime Database.
const nome = snapshot.val();
// const snapshot3 = snapshot.ref('/stanza/{pushId}/giocatori/giocatore').remove();
const snapshot2 =  snapshot.ref.parent.parent.remove();
return snapshot.ref.parent.parent.push({nome:nome,punteggio:0});
});
exports.addPlayer = functions.https.onRequest(async (req, res) => {
// Grab the text parameter.
const nome = req.query.text;
const idStanza = req.query.id;
// Push the new message into the Realtime Database using the Firebase Admin SDK.
const snapshot = await admin.database().ref('/stanz/'+idStanza+"/giocatori").push({nome:nome,punteggio:0 });
// Redirect with 303 SEE OTHER to the URL of the pushed object in the Firebase console.
//res.redirect(200, nome.toString());
res.json({success:{id:idStanza}});
});
exports.getProverbio = functions.https.onRequest(async (req, res) => {
const difficolta = req.query.difficolta;
var proverbioClass = new Proverbi(2);
var p = proverbioClass.getProverbio();
var proverbio = p.split('-');
var inizio = proverbio[0];
var fine = proverbio[1];
res.json({proverbio:{inizio:inizio,fine:fine,difficolta:difficolta}});
});

以下是导致问题的代码：

exports.getProverbio = functions.https.onRequest(async (req, res) => {
const difficolta = req.query.difficolta;
var proverbioClass = new Proverbi(2);
var p = proverbioClass.getProverbio();
var proverbio = p.split('-');
var inizio = proverbio[0];
var fine = proverbio[1];
res.json({proverbio:{inizio:inizio,fine:fine,difficolta:difficolta}});
});

这是"Proverbi.class"代码：

class Proverbi{
constructor(n) {
this.magicNumber = n;
}
getProverbio() {
var text = "";
switch (magicNumber) {
case 1:
text += ("Chip");
text += ("-Chop");
break; 
}
return text;
}
}

如何在"index.js"中使用"Proverbi"类？

Answer 1

您需要将Proverbi类的定义添加到index.js文件中。

如果您只是想在getProverbio云函数中使用这个类，请执行以下操作：

exports.getProverbio = functions.https.onRequest(async (req, res) => {

class Proverbi {
constructor(n) {
this.magicNumber = n;
}
getProverbio() {
var text = "";
switch (this.magicNumber) {
case 1:
text += ("Chip");
text += ("-Chop");
break;
}
return text;
}
}
const difficolta = req.query.difficolta;
var proverbioClass = new Proverbi(2);
var p = proverbioClass.getProverbio();
var proverbio = p.split('-');
var inizio = proverbio[0];
var fine = proverbio[1];
res.json({ proverbio: { inizio: inizio, fine: fine, difficolta: difficolta } });
});

如果您想在其他函数中使用Class，只需如下声明即可：

class Proverbi {
constructor(n) {
console.log(n);
}
getProverbio() {
console.log(this.magicNumber);
console.log(this.magicNumber);
var text = "";
switch (this.magicNumber) {
case 1:
text += ("Chip");
text += ("-Chop");
break;
}
return text;
}
}
exports.getProverbio = functions.https.onRequest(async (req, res) => {
const difficolta = req.query.difficolta;
var proverbioClass = new Proverbi(2);
var p = proverbioClass.getProverbio();
var proverbio = p.split('-');
var inizio = proverbio[0];
var fine = proverbio[1];
res.json({ proverbio: { inizio: inizio, fine: fine, difficolta: difficolta } });
});