<WebView Source="https://www.baidu.com">
    
  </WebView>

　　可以用後臺程式碼和webview互動，例如webview.Eval("alert('hello')");

xamarin.form原生webview有很多bug，建議使用第三方的view控制元件HybirdWebView

如果要使用這個view，需要安裝XLabs.Serialization.JSON，和XLabs.Forms

然後在ios中將appdelegate修改為

    // The UIApplicationDelegate for the application. This class is responsible for launching the 
    // User Interface of the application, as well as listening (and optionally responding) to 
    // application events from iOS.
    [Register("AppDelegate")]
    public partial class AppDelegate : XLabs.Forms.XFormsApplicationDelegate
    {
        //
        // This method is invoked when the application has loaded and is ready to run. In this 
        // method you should instantiate the window, load the UI into it and then make the window
        // visible.
        //
        // You have 17 seconds to return from this method, or iOS will terminate your application.
        //
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            SetIoc();
            global::Xamarin.Forms.Forms.Init();
            LoadApplication(new App());

            return base.FinishedLaunching(app, options);
        }
        private void SetIoc()
        {
            var resolverContainer = new SimpleContainer();
            resolverContainer.Register<IJsonSerializer, JsonSerializer>();
            Resolver.SetResolver(resolverContainer.GetResolver());
        }
    }

　　在android中修改mainactive修改為

[Activity(Label = "App2", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : XFormsApplicationDroid
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            //TabLayoutResource = Resource.Layout.Tabbar;
            //ToolbarResource = Resource.Layout.Toolbar;
            SetIoc();
            base.OnCreate(savedInstanceState);
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
            LoadApplication(new App());
        }
        private void SetIoc()
        {
            var resolverContainer= new SimpleContainer();
            resolverContainer.Register<IJsonSerializer, JsonSerializer>();
            Resolver.SetResolver(resolverContainer.GetResolver());
        }
    }

　　LoadFinished事件載入完成事件

　　CallJsFunction("alert","你好");

在html中加入程式碼註冊按鈕回掉後臺程式碼

function Callback(){
    Native("datacallback","this is callback paramer");
}

　　然後在後臺程式碼中加入

webView.RegisterCallback("datacallback",t=>{T就是引數});