Flutter -如何在屏幕中间自动点击WebView中的按钮？

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

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

class _MyWebViewState extends State<MyWebView> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('WebView'),
      ),
      body: WebView(
        initialUrl: 'https://example.com',
        onWebViewCreated: (WebViewController webViewController) {
          _controller.complete(webViewController);
          webViewController.addJavascriptChannel(
              name: 'buttonClickChannel',
              onMessageReceived: (JavascriptMessage message) {
                if (message.message == 'buttonClicked') {
                  // 按钮被点击，执行相应操作
                }
              });
        },
        onPageFinished: (String url) {
          _controller.future.then((WebViewController webViewController) {
            webViewController.evaluateJavascript('''
              // 在这里执行JavaScript代码，模拟点击按钮
              var button = document.getElementById('buttonId');
              button.click();
            ''');
          });
        },
      ),
    );
  }
}