**
FirebaseError: Firebase: 沒有創建 Firebase 應用“[DEFAULT]”
- 呼叫 Firebase App.initializeApp()（應用程式/無應用程式）。
**
超過 7 天我自己試圖解決我的“flutter admin web app”問題。但我不能。
√ 我的 firebase 身份驗證是：匿名 √ Flutter（通道測驗版，2.7.0-3.1.pre √ Dart 2.15 版 √ Android 工具鏈 - 為 Android 設備開發（Android SDK 版本 31.0.0） √ Chrome - 為網路開發 √ Android Studio （2020.3 版）
我該如何解決問題？
請幫我。誰知道呢，親愛的導師。
index.html（檔案）
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
For more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
-->
<base href="/">
<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="grocery_admin_app_flutter">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<title>grocery_admin_app_flutter</title>
<link rel="manifest" href="manifest.json">
</head>
<body>
<!-- This script installs service_worker.js to provide PWA functionality to
application. For more information, see:
https://developers.google.com/web/fundamentals/primers/service-workers -->
<!-- The core Firebase JS SDK is always required and must be listed first -->
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-firestore.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-storage.js"></script>
<script type="text/javascript">
let useHtml = // ...
if(useHtml) {
window.flutterWebRenderer = "html";
} else {
window.flutterWebRenderer = "canvaskit";
}
</script>
<script src="main.dart.js" type="application/javascript"></script>
<script>
// Your web app's Firebase configuration
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
const firebaseConfig = {
apiKey: "AIzaSyAgoXpOjiZntQBEMqt7ZDrcFpLRmH1ZwCM",
authDomain: "jaituncshop.firebaseapp.com",
databaseURL: "https://jaituncshop-default-rtdb.firebaseio.com",
projectId: "jaituncshop",
storageBucket: "jaituncshop.appspot.com",
messagingSenderId: "338592147861",
appId: "1:338592147861:web:14315ce1d827ad50c1ee9c",
measurementId: "G-TG69GZ1VSX"
};
// Initialize Firebase
const app = initializeApp(firebaseConfig);
const analytics = getAnalytics(app);
</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>
uj5u.com熱心網友回復：
我昨天遇到了完全相同的問題，大多數解決方案都沒有解決問題。我終于解決了它并將發布我的整個 index.html 以便您可以使用它。如果可能，逐字使用它，當它起作用時，您就可以開始編輯了。
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
Fore more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
-->
<base href="/">
<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="fiber">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png" />
<title>Your title</title>
<link rel="manifest" href="manifest.json">
</head>
<body>
<!-- This script installs service_worker.js to provide PWA functionality to
application. For more information, see:
https://developers.google.com/web/fundamentals/primers/service-workers -->
<script>
if ('serviceWorker' in navigator) {
window.addEventListener('flutter-first-frame', function () {
navigator.serviceWorker.register('flutter_service_worker.js');
});
}
</script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-firestore.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-functions.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-messaging.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-storage.js"></script>
<script>
const firebaseConfig = {
apiKey: "...",
authDomain: "...",
databaseURL: "...,
projectId: "...",
storageBucket: "...",
messagingSenderId: "...",
appId: "...",
measurementId: "..."
};
firebase.initializeApp(firebaseConfig);
</script>
<script src="main.dart.js" type="application/javascript"></script>
</body>
</html>
但只要看看你的代碼，我就可以告訴你這一行<script src="main.dart.js" type="application/javascript"></script>必須放在最后，因為它使用了“app”
轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/342545.html
上一篇：如何在顫振中實作滾動條軌道顏色？