我一直致力于将基于 Flutter 风格的 Firebase 项目分离为开发、暂存和生产。我已经阅读了很多文章，并为 ios 和 android（目前只有两个环境）设置了用于 staging 和 prod 的 Firebase 项目。但是，我在集成到Firebase Hosting时遇到了一个问题，
<meta name="google-signin-client_id" content="MY_GOOGLE_SIGNIN_CLIENT_ID" /><!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
This is a placeholder for base href that will be replaced by the value of
the `--base-href` argument provided to `flutter build`.
-->
<base href="$FLUTTER_BASE_HREF">
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
// whichever placed first below recognized as the targeted google signin client id
<meta name="google-signin-client_id" content="MY_GOOGLE_SIGNIN_CLIENT_ID_FOR_STAGING" />
<meta name="google-signin-client_id" content="MY_GOOGLE_SIGNIN_CLIENT_ID_FOR_PROD" />
<!-- 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="MY_PROJECT_NAME">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png"/>
<title>MY_PROJECT_NAME</title>
<link rel="manifest" href="manifest.json">
<script>
// The value below is injected by flutter build, do not touch.
const serviceWorkerVersion = "{{flutter_service_worker_version}}";
</script>
<!-- This script adds the flutter initialization JS code -->
<script src="flutter.js" defer></script>
</head>
<body>
<script src="flutter_bootstrap.js" async></script>
</body>
</html>
与我为 Android 和 ios 分离环境所做的工作不同，我在任何地方都找不到任何使用 Firebase Hosting for Flutter Web 分离环境的线索（实际上我发现它使用脚本文件here管理多个 index.hteml 文件，其中我不喜欢）。
我想实现根据风格将 Flutter Web 配置到 Firebase 托管。
如果有人可以帮助我提供详细说明，我将非常感激。
您不能在 Web 应用程序中使用风味功能，这只是 Android 和 iOS 功能：https://docs.flutter.dev/deployment/flavors
在这种情况下我能看到的唯一解决方案：准备单独的脚本来构建开发/登台。在构建之前，您的脚本需要使用 firebase 相关配置内容替换/符号链接文件。