升级 Flutter 后，我遇到了以下两个与我的 index.html 文件相关的警告：
Warning: In index.html:37: Local variable for "serviceWorkerVersion" is deprecated. Use "{{flutter_service_worker_version}}" template token instead.
Warning: In index.html:46: "FlutterLoader.loadEntrypoint" is deprecated. Use "FlutterLoader.load" instead.
这些警告表明我的index.html 文件中的某些元素正在使用已弃用的方法。这是我当前的index.html 文件：
<!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="chapter 04">
<!-- 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_layout">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png"/>
<title>flutter_layout</title>
<link rel="manifest" href="manifest.json">
<script>
// The value below is injected by flutter build, do not touch.
const serviceWorkerVersion = null;
</script>
<!-- This script adds the flutter initialization JS code -->
<script src="flutter.js" defer></script>
</head>
<body>
<script>
window.addEventListener('load', function(ev) {
// Download main.dart.js
_flutter.loader.loadEntrypoint({
serviceWorker: {
serviceWorkerVersion: serviceWorkerVersion,
},
onEntrypointLoaded: function(engineInitializer) {
engineInitializer.initializeEngine().then(function(appRunner) {
appRunner.runApp();
});
}
});
});
</script>
</body>
</html>
serviceWorkerVersion{{flutter_service_worker_version}}FlutterLoader.loadEntrypointFlutterLoader.load我感谢有关如何解决这些弃用警告的任何指导或示例。谢谢！
web/index.html来自
const serviceWorkerVersion = null;
至
const serviceWorkerVersion = {{flutter_service_worker_version}};
来自
<body>
<script>
window.addEventListener('load', function(ev) {
// Download main.dart.js
_flutter.loader.loadEntrypoint({
serviceWorker: {
serviceWorkerVersion: serviceWorkerVersion,
},
onEntrypointLoaded: function(engineInitializer) {
engineInitializer.initializeEngine().then(function(appRunner) {
appRunner.runApp();
});
}
});
});
</script>
</body>
至
<body>
<script src="flutter_bootstrap.js" async></script>
</body>