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Flutter 应用程序专为移动和 Web 设计。我们正在使用 firebase_messaging 进行消息传递功能。早些时候它是工作魅力。最近我们将 Flutter SDK 升级到了 2.0 版本（Channel stable, 2.0.4）。

该应用程序的工作方式与移动版本中的早期一样。但是在网页版中执行时给了我下面提到的错误并且无法解决。

以下命令已经尝试禁用空安全但没有用。

flutter run --no-sound-null-safety

错误日志：

Debug service listening on ws://127.0.0.1:53789/y22KqzTNKwU=/ws

Running with unsound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety
Debug service listening on ws://127.0.0.1:53789/y22KqzTNKwU=/ws
TypeError: Cannot read property 'isSupported' of undefined
    at new firebase_messaging_web.FirebaseMessagingWeb.new (http://localhost:53495/packages/firebase_messaging_web/firebase_messaging_web.dart.lib.js:189:51)
    at Function.registerWith (http://localhost:53495/packages/firebase_messaging_web/firebase_messaging_web.dart.lib.js:56:73)
    at Object.registerPlugins (http://localhost:53495/packages/pca_app/generated_plugin_registrant.dart.lib.js:44:49)
    at main (http://localhost:53495/web_entrypoint.dart.lib.js:44:35)
    at main.next (<anonymous>)
    at runBody (http://localhost:53495/dart_sdk.js:39051:34)
    at Object._async [as async] (http://localhost:53495/dart_sdk.js:39082:7)
    at main$ (http://localhost:53495/web_entrypoint.dart.lib.js:43:18)
    at http://localhost:53495/main_module.bootstrap.js:19:10
    at Array.forEach (<anonymous>)
    at window.$dartRunMain (http://localhost:53495/main_module.bootstrap.js:18:32)
    at <anonymous>:1:8
    at Object.runMain (http://localhost:53495/dwds/src/injected/client.js:8656:21)
    at http://localhost:53495/dwds/src/injected/client.js:22068:19
    at _wrapJsFunctionForAsync_closure.$protected (http://localhost:53495/dwds/src/injected/client.js:3830:15)
    at _wrapJsFunctionForAsync_closure.call$2 (http://localhost:53495/dwds/src/injected/client.js:10905:12)
    at Object._asyncStartSync (http://localhost:53495/dwds/src/injected/client.js:3794:20)
    at main__closure1.$call$body$main__closure (http://localhost:53495/dwds/src/injected/client.js:22080:16)
    at main__closure1.call$1 (http://localhost:53495/dwds/src/injected/client.js:22007:19)
    at StaticClosure._rootRunUnary [as call$2$5] (http://localhost:53495/dwds/src/injected/client.js:4153:16)
    at _CustomZone.runUnary$2$2 (http://localhost:53495/dwds/src/injected/client.js:12136:39)
    at _CustomZone.runUnaryGuarded$1$2 (http://localhost:53495/dwds/src/injected/client.js:12068:14)
    at _ControllerSubscription._sendData$1 (http://localhost:53495/dwds/src/injected/client.js:11697:19)
    at _DelayedData.perform$1 (http://localhost:53495/dwds/src/injected/client.js:11849:59)
    at _PendingEvents_schedule_closure.call$0 (http://localhost:53495/dwds/src/injected/client.js:11898:14)
    at Object._microtaskLoop (http://localhost:53495/dwds/src/injected/client.js:3990:24)
    at StaticClosure._startMicrotaskLoop (http://localhost:53495/dwds/src/injected/client.js:3996:11)
    at _AsyncRun__initializeScheduleImmediate_internalCallback.call$1 (http://localhost:53495/dwds/src/injected/client.js:10774:9)
    at invokeClosure (http://localhost:53495/dwds/src/injected/client.js:1250:26)
    at MutationObserver.<anonymous> (http://localhost:53495/dwds/src/injected/client.js:1269:18)

Flutter 医生报告：

> Doctor summary (to see all details, run flutter doctor -v): [√]
> Flutter (Channel stable, 2.0.4, on Microsoft Windows [Version
> 10.0.18363.1441], locale en-GB) [√] Android toolchain - develop for Android devices (Android SDK version 30.0.2) [√] Chrome - develop for
> the web [√] Android Studio (version 4.0) [√] VS Code (version 1.41.1)
> [√] Connected device (2 available)
> 
> • No issues found!
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1 回答 1

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2021 年 9 月更新：

将此8.6.1SDK 添加到您的index.html，它应该看起来像这样的布局。

<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-messaging.js"></script>

到目前为止，这是推荐的。运行它没有Stable channel 2.5.0错误

  firebase_messaging: ^10.0.3
  firebase_messaging_web: ^2.0.2
  firebase_core: ^1.6.0
  firebase_core_web: ^1.1.0
于 2021-04-08T10:03:43.047 回答