我有一个简单的可观察值，表示列表的长度。
随着它的发展，我想为该数字的增减设置动画，例如：
但是在淡出期间，我可以看到下一个已被更新的值。我发现解决问题的两种方法是：
'use strict';
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const cors = require('cors')({origin: true});
const express = require('express');
const cookieParser = require('cookie-parser')();
const app = express();
admin.initializeApp();
const validateFirebaseIdToken = async (req, res, next) => {
if ((!req.headers.authorization || !req.headers.authorization.startsWith('Bearer ')) &&
!(req.cookies && req.cookies.__session)) {
console.error('No Firebase ID token was passed as a Bearer token in the Authorization header.',
'Make sure you authorize your request by providing the following HTTP header:',
'Authorization: Bearer <Firebase ID Token>',
'or by passing a "__session" cookie.');
res.status(403).send('Unauthorized');
return;
}
let idToken;
if (req.headers.authorization && req.headers.authorization.startsWith('Bearer ')) {
// Read the ID Token from the Authorization header.
idToken = req.headers.authorization.split('Bearer ')[1];
} else if(req.cookies) {
// Read the ID Token from cookie.
idToken = req.cookies.__session;
} else {
// No cookie
res.status(403).send('Unauthorized');
return;
}
try {
const decodedIdToken = await admin.auth().verifyIdToken(idToken);
req.user = decodedIdToken;
next();
return;
} catch (error) {
console.error('Error while verifying Firebase ID token:', error);
res.status(403).send('Unauthorized');
return;
}
};
app.use(cors);
app.use(cookieParser);
app.use(validateFirebaseIdToken);
app.post("/test", (req, res) => {
res.status(500).send("This message will never appear in the editor");
});
exports.ThisTestFails = functions.https.onRequest(app);
exports.ThisTestWorks = functions.https.onCall((data, context) => {
throw new functions.https.HttpsError('invalid-argument', 'This message will appear in the editor');
});
有条件地延迟值更新（here是对该方法的法语解释，有示例代码）对于我想要的东西，两者似乎都太复杂了。所以这是我的问题。
是否可以在给元素添加动画时阻止DOM更新？