webView.CoreWebView2.AddHostObjectToScript("webBrowserObj", new ScriptCallbackObject());

 await webView.CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync("var webBrowserObj= window.chrome.webview.hostObjects.webBrowserObj;");

[ClassInterface(ClassInterfaceType.AutoDual)]
 [ComVisible(true)]
 /// <summary>
 /// 網(wǎng)頁調(diào)用C#方法
 /// </summary>
 public class ScriptCallbackObject
 {
  public string UserName { get; set; } = "我是C#屬性";

  public void ShowMessage()
  {
   MessageBox.Show("網(wǎng)頁調(diào)用C#");
  }

  public void ShowMessageArg(string arg)
  {
   MessageBox.Show("【網(wǎng)頁調(diào)用C#】:" + arg);
  }

  public string GetData(string arg)
  {
   return "【網(wǎng)頁調(diào)用C#獲取數(shù)據(jù)】;" + arg;
  }

  [System.Runtime.CompilerServices.IndexerName("Items")]
  public string this[int index]
  {
   get { return m_dictionary[index]; }
   set { m_dictionary[index] = value; }
  }
  private Dictionary<int, string> m_dictionary = new Dictionary<int, string>();  
 }

function callCsharp2() {
 var data2 = $("#txtArg").attr("value"); //大坑 值不會時刻變化   // alert(data2);   var data = $("#txtArg").val(); 
   window.chrome.webview.hostObjects.webBrowserObj.ShowMessageArg(data);   //window.chrome.webview.postMessage(data);  };
async function callCsharp3() {
 var data = $("#txtArg").val();
 var result = await webBrowserObj.GetData(data);
 alert(result);
};

async function callCsharp4() { 

   const propValue = await webBrowserObj.UserName;
   console.log(propValue);
   alert(propValue);
};

private void callJS_Click(object sender, RoutedEventArgs e)
  {
   webView.CoreWebView2.ExecuteScriptAsync("ShowMessage()");   
  }

  private void callJSArg_Click(object sender, RoutedEventArgs e)
  {
   webView.CoreWebView2.ExecuteScriptAsync($"ShowMessageArg('{txtArg.Text}')");
  }

  private async void callJSGetData_Click(object sender, RoutedEventArgs e)
  {
   var jsResult = await webView.CoreWebView2.ExecuteScriptAsync($"GetData('{txtArg.Text}')");
   if (!string.IsNullOrEmpty(jsResult))
   {
    MessageBox.Show(jsResult);
   }   
  }

//2、C#調(diào)用網(wǎng)頁
  var jsVar = '123';
  function Hello() {
   alert('調(diào)用Js' + jsVar);
  };

  function ShowMessage() {
   alert('我是網(wǎng)頁');
  };
  function ShowMessageArg(arg) {
   alert('【我是網(wǎng)頁消息框】' + arg);
  };
  function GetData(arg) {
   return '【我是網(wǎng)頁返回給你】:' + arg;
  };

webView.CoreWebView2.Settings.IsZoomControlEnabled = false;