flutter_webview_plugin如何监听更改为javascript的url

import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'WebView Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyWebView(),
    );
  }
}

class MyWebView extends StatefulWidget {
  @override
  _MyWebViewState createState() => _MyWebViewState();
}

class _MyWebViewState extends State<MyWebView> {
  final flutterWebViewPlugin = FlutterWebviewPlugin();

  @override
  void initState() {
    super.initState();

    // 监听URL更改
    flutterWebViewPlugin.onUrlChanged.listen((String url) {
      // 在这里处理URL更改的逻辑
      print('URL changed: $url');
    });
  }

  @override
  void dispose() {
    // 释放资源
    flutterWebViewPlugin.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return WebviewScaffold(
      url: 'https://example.com',
      appBar: AppBar(
        title: Text('WebView Demo'),
      ),
      withJavascript: true,
      withLocalStorage: true,
      hidden: true,
      initialChild: Container(
        color: Colors.white,
        child: Center(
          child: CircularProgressIndicator(),
        ),
      ),
    );
  }
}