webview_flutter目标_blank不工作

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

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

class _MyWebViewState extends State<MyWebView> {
  WebViewPlatformController? _controller;

  @override
  Widget build(BuildContext context) {
    return WebView(
      initialUrl: 'https://example.com',
      javascriptMode: JavascriptMode.unrestricted,
      onWebViewCreated: (controller) {
        _controller = controller;
        _controller?.loadUrl('https://example.com');
      },
      navigationDelegate: (NavigationRequest request) {
        if (request.url != 'https://example.com') {
          // 打开新的标签页
          _controller?.evaluateJavascript('window.open("${request.url}","_blank");');
          return NavigationDecision.prevent;
        }
        return NavigationDecision.navigate;
      },
    );
  }
}