Asp.net mvc 向asp.net mvc发送json ajax post请求时出错

我正在将sencha touch的ajax请求发送到我的asp.net mvc服务：

 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.');
        }
    });

以下是服务代码：

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

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你能帮我吗

看起来您需要在Web API上启用跨源资源共享。默认情况下，运行应用程序的web浏览器将不允许您调用其他域（其他端口被视为跨域）。下面是关于如何在Web API 2上执行此操作的详细信息

编辑：如果您使用的是Web API 1。。。

---

谢谢，现在它可以工作了，但在我的服务中，登录什么都不做。

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.