發送JSON AJAX POST請求到ASP.NET MVC錯誤

我把從煎茶觸摸Ajax請求我的asp.net mvc的服務：發送JSON AJAX POST請求到ASP.NET MVC錯誤

Ext.Ajax.request({ 
     url: 'http://localhost:52771/api/login', 
     method: 'post', 
        defaultHeaders : 'application/json', 
     params: { 
      post: JSON.stringify ({ 
        user: username, 
        pwd: password 
       }) 
     }, 
     success: function (response) { 

      var loginResponse = Ext.JSON.decode(response.responseText); 

      if (loginResponse === true) { 
       // The server will send a token that can be used throughout the app to confirm that the user is authenticated. 
       me.sessionToken = loginResponse.sessionToken; 
       me.signInSuccess();  //Just simulating success. 
      } else { 
       me.signInFailure(loginResponse.message); 
      } 
     }, 
     failure: function (response) { 
      me.sessionToken = null; 
      me.signInFailure('Login failed. Please try again later.'); 
     } 
    });

這裏是服務代碼：

Namespace SimpleSevice 
Public Class LoginController 
    Inherits ApiController 

    Private Shared list As IList(Of Login1) = New List(Of Login1)(_ 
       {New Login1() With {.user = "User", .pwd = "Password"}, _ 
       New Login1() With {.user = "User1", .pwd = "Password1"}, _ 
       New Login1() With {.user = "User2", .pwd = "Password2"} 
       } 
    ) 

    <System.Web.Mvc.AcceptVerbs("GET")> _ 
    Public Function GetLogin() As IEnumerable(Of Login1) 
     Return list 
    End Function 

    <System.Web.Mvc.HttpPost> _ 
    Public Function PostLogin(ByVal login As Login1) As Net.Http.HttpResponseMessage 
     If login.user = "John" AndAlso login.pwd = "Human" Then 
      Return Request.CreateResponse(Of Boolean)(Net.HttpStatusCode.OK, True) 
     End If 
     Return Request.CreateResponse(Of Boolean)(Net.HttpStatusCode.NotFound, False) 
    End Function 

    End Class 
End Namespace

我得到這些錯誤：

OPTIONS http://localhost:52771/api/login?_dc=1391588046145 405 (Method Not Allowed) 

OPTIONS http://localhost:52771/api/login?_dc=1391588046145 No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access. 

XMLHttpRequest cannot load http://localhost:52771/api/login?_dc=1391588046145. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.

你能幫我嗎？

來源

2014-02-05 Aram Gevorgyan