webview js关闭页面

// 在 Activity 中定义一个关闭页面的方法
public void closePage() {
    finish();
}

// 在 WebView 中添加 JavaScript 接口
webView.addJavascriptInterface(new Object() {
    @JavascriptInterface
    public void close() {
        closePage();
    }
}, "Android");

// 在网页中调用关闭方法
<button onclick="window.Android.close();">Close</button>

// 定义一个协议
protocol WebViewDelegate: AnyObject {
    func closeWebView()
}

// 在 ViewController 中实现协议
class ViewController: UIViewController, WebViewDelegate {
    func closeWebView() {
        dismiss(animated: true, completion: nil)
    }
}

// 在 WKWebView 中设置代理
webView.navigationDelegate = self
webView.uiDelegate = self

// 在网页中调用关闭方法
<button onclick="window.webkit.messageHandlers.closeHandler.postMessage(null);">Close</button>

// 在 ViewController 中处理消息
extension ViewController: WKScriptMessageHandler {
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        if message.name == "closeHandler" {
            closeWebView()
        }
    }
}

public class MainActivity extends AppCompatActivity {
    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = findViewById(R.id.webview);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.addJavascriptInterface(new Object() {
            @JavascriptInterface
            public void close() {
                finish();
            }
        }, "Android");
        webView.loadUrl("https://example.com");
    }
}

import UIKit
import WebKit

class ViewController: UIViewController, WKScriptMessageHandler {
    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let config = WKWebViewConfiguration()
        config.userContentController.add(self, name: "closeHandler")

        webView = WKWebView(frame: view.bounds, configuration: config)
        view.addSubview(webView)

        let url = URL(string: "https://example.com")!
        let request = URLRequest(url: url)
        webView.load(request)
    }

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        if message.name == "closeHandler" {
            dismiss(animated: true, completion: nil)
        }
    }
}