webview js交互带参数

// 在WebView中启用JavaScript
webView.getSettings().setJavaScriptEnabled(true);

// 添加JavaScript接口
webView.addJavascriptInterface(new WebAppInterface(this), "Android");

// 定义JavaScript接口类
public class WebAppInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    WebAppInterface(Context c) {
        mContext = c;
    }

    /** Show a toast from the web page */
    @JavascriptInterface
    public void showToast(String toast) {
        Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
    }
}

<button onclick="window.Android.showToast('Hello Android!')">Say hello</button>

// 在WKWebView中启用JavaScript
webView.configuration.preferences.javaScriptEnabled = true

// 添加JavaScript消息处理器
webView.configuration.userContentController.add(self, name: "iOSHandler")

// 实现WKScriptMessageHandler协议
extension ViewController: WKScriptMessageHandler {
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        if message.name == "iOSHandler", let messageBody = message.body as? String {
            showAlert(message: messageBody)
        }
    }

    func showAlert(message: String) {
        // 显示提示框
    }
}

<button onclick="window.webkit.messageHandlers.iOSHandler.postMessage('Hello iOS!')">Say hello</button>