未捕获参考错误：扑翼中未定义FireBase [英] Uncaught ReferenceError: firebase is not defined in Flutter
本文介绍了未捕获参考错误：扑翼中未定义FireBase的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我无法初始化Firebase在我的颤动项目中，我尝试了导入firebase-app.js、firebase-auth.js和firebase-analytics.js，但都不起作用我目前正在使用Firebase 9.0.1，我厌倦了解决这个错误它在一周内没有得到解决，我已经尝试了Stackoverflow上的所有方法，并搜索了有关Firebase和Fflats的文档。我附上了下面生成和运行时得到的错误检查的屏幕截图，
另外，我已在Firebase控制台中启用了Firebase功能，因此到目前为止，是否需要将其导入到我的项目中？我现在不使用它，但必须这样做吗？
第一次运行时flutter run -d chrome错误输出为
main.dart：
import 'package:flutter/material.dart';
import 'package:devcom/auth.dart';
import 'package:devcom/auth_provider.dart';
import 'package:devcom/root_page.dart';
import 'package:firebase_core/firebase_core.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return AuthProvider(
auth: Auth(),
child: MaterialApp(
title: 'Flutter login demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: RootPage(),
),
);
}
}
index.html：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
<!-- iOS meta tags & icons -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="devcom">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="shortcut icon" type="image/png" href="favicon.png" />
<title>Devcom</title>
<link rel="manifest" href="manifest.json">
</head>
<body >
<script src="https://www.gstatic.com/firebasejs/9.0.1/firebase-app.js" type = "module"></script>
<script src="https://www.gstatic.com/firebasejs/9.0.1/firebase-analytics.js" type="module"> </script>
<script src="https://www.gstatic.com/firebasejs/9.0.1/firebase-auth.js" type = "module"></script>
<script src="https://www.gstatic.com/firebasejs/9.0.1/firebase-firestore.js" type="module"></script>
<!-- The core Firebase JS SDK is always required and must be listed first --><script> var firebaseConfig = {
apiKey: "...",
authDomain: "......",
databaseURL: ".....",
projectId: "...",
storageBucket: "",
messagingSenderId: "",
measurementId: "",
appId: "1:.........:web:...........",
};
firebase.initializeApp(firebaseConfig); // the error is pointing out this line for the cause
firebase.analytics();
</script><script>
var serviceWorkerVersion = null;
var scriptLoaded = false;
function loadMainDartJs() {
if (scriptLoaded) {
return;
}
scriptLoaded = true;
var scriptTag = document.createElement('script');
scriptTag.src = 'main.dart.js';
scriptTag.type = 'application/javascript';
document.body.append(scriptTag);
}
if ('serviceWorker' in navigator) {
// Service workers are supported. Use them.
window.addEventListener('load', function () {
// Wait for registration to finish before dropping the <script> tag.
// Otherwise, the browser will load the script multiple times,
// potentially different versions.
var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
navigator.serviceWorker.register(serviceWorkerUrl)
.then((reg) => {
function waitForActivation(serviceWorker) {
serviceWorker.addEventListener('statechange', () => {
if (serviceWorker.state == 'activated') {
console.log('Installed new service worker.');
loadMainDartJs();
}
});
}
if (!reg.active && (reg.installing || reg.waiting)) {
// No active web worker and we have installed or are
installing
// one for the first time. Simply wait for it to activate.
waitForActivation(reg.installing ?? reg.waiting);
} else if
(!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
// When the app updates the serviceWorkerVersion changes,
so we
// need to ask the service worker to update.
console.log('New service worker available.');
reg.update();
waitForActivation(reg.installing);
} else {
// Existing service worker is still good.
console.log('Loading app from service worker.');
loadMainDartJs();
}
});
// If service worker doesn't succeed in a reasonable amount of time,
// fallback to plaint <script> tag.
setTimeout(() => {
if (!scriptLoaded) {
console.warn(
'Failed to load app from service worker. Falling back to plain <script> tag.',
);
loadMainDartJs();
}
}, 4000);
});
} else {
// Service workers not supported. Just drop the <script> tag.
loadMainDartJs();
}
</script>
</body>
</html>
pubspec.yaml：
dependencies:
flutter:
sdk: flutter
firebase_auth:
cupertino_icons:
firebase_core:
firebase_core_web:
firebase_auth_web:
dev_dependencies:
flutter_test:
sdk: flutter
mockito:
建议使用8.7.1版的编辑：
它抛出我：Failed to load resource: net::ERR_NAME_NOT_RESOLVED
推荐答案
问题原因是Auth在Myapp类中使用的。DART如果我们从那里删除AuthProvider小部件，它就可以正常工作，而且需要将版本从9更改为版本8.7.1，因为颤动绑定是建立在此基础上的，而对版本9的支持尚未到来。
这篇关于未捕获参考错误：扑翼中未定义FireBase的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
