vue3 class JsExtention JavascriptObjectRepository.Register

Question

vue3 class JsExtention JavascriptObjectRepository.Register 定义的方法

 chromeBrowser = new ChromiumWebBrowser("D:/QMDownload/tbl/file/WEBClient/WEBClient/WebClient/bin/x64/Debug/1.htm");
chromeBrowser.JavascriptObjectRepository.Register("googleBrower", new JsExtention(), isAsync: false, options: BindingOptions.DefaultBinder);
public class JsExtention
    {
        public string MessageText = "111111";
        public void ShowTest()
        {
            MessageBox.Show("this in C#.\n\r" + MessageText);
        }
    }

googleBrower.showTest 

因为googleBrower.showTest 是在c#pc客户端程序定义的，本地打包报错

googleBrower.showTest 未定义

怎么在vue3声明一下