NoSuchMethodError：创建新用户时尝试调用非函数，如 null: 'dart.global.firebase.auth'
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【中文标题】NoSuchMethodError：创建新用户时尝试调用非函数，如 null: \'dart.global.firebase.auth\'【英文标题】：NoSuchMethodError: tried to call a non-function, such as null: 'dart.global.firebase.auth' when creating new userNoSuchMethodError：创建新用户时尝试调用非函数，如 null: 'dart.global.firebase.auth' 【发布时间】：2021-08-02 08:23:25 【问题描述】：我一直在尝试让 firebase 身份验证在我的 Flutter Web 应用程序上运行，但是当我尝试创建新用户时，我最终遇到了以下问题。
跑线时：
UserCredential result = await _auth.signInAnonymously();
我收到以下错误：
NoSuchMethodError: 试图调用一个非函数，比如null: 'dart.global.firebase.auth'
我已经尝试按照其他人的修复程序解决相同的问题，例如将内容移到我的 index.html 文件的头部，但是到目前为止没有任何效果。
这是我的 pubspec.yaml
description: A new Flutter project.
# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In ios, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^1.0.2
firebase: ^9.0.1
firebase_storage: ^8.0.4
firebase_auth: ^1.1.4
flutter_login: ^1.0.10
flutter_svg: ^0.19.3
google_sign_in: ^5.0.2
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
# To add assets to your application, add an assets section, like this:
assets:
- assets/logo.gif
# - images/a_dot_ham.jpeg
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/assets-and-images/#from-packages
# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.dev/custom-fonts/#from-packages
这是我的 index.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="flutter_4paul">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png"/>
<title>flutter_4paul</title>
<link rel="manifest" href="manifest.json">
<!-- 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 src="https://www.gstatic.com/firebasejs/8.5.0/firebase-app.js"></script>
<!-- TODO: Add SDKs for Firebase products that you want to use
https://firebase.google.com/docs/web/setup#available-libraries -->
<script src="/__/firebase/8.5.0/firebase-auth.js"></script>
<script src="/__/firebase/8.5.0/firebase-database.js"></script>
<script>
// Your web app's Firebase configuration
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
var firebaseConfig =
//my config info
;
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
</script>
</body>
<script>
if ('serviceWorker' in navigator)
window.addEventListener('flutter-first-frame', function ()
navigator.serviceWorker.register('flutter_service_worker.js');
);
</script>
<script src="main.dart.js" type="application/javascript"></script>
</head>
<!-- The core Firebase JS SDK is always required and must be listed first -->
</html>
【问题讨论】：
【参考方案1】：我解决了这个问题，
之前
final FirebaseAuth _authr = FirebaseAuth.instance;
在我的班级顶部定义，而不是使用 _authr 我只是使用
UserCredential result = await FirebaseAuth.instance
.createUserWithEmailAndPassword(email: em, password: pass);
不完全确定这是如何修复它的，因为重新定义它并没有真正改变它......但如果它有效，它就有效！
【讨论】：
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