jQuery ajax调用webservice注意事项

<httpHandlers>   <remove verb="*" path="*.asmx"/>   <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>  </httpHandlers>

<webServices>   <protocols>    <add name="HttpPost" />    <add name="HttpGet" />   </protocols>  </webServices>

/// <summary>  /// UserValidate 的摘要说明  /// </summary>  [WebService(Namespace = "http://tempuri.org/")]  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]  [System.ComponentModel.ToolboxItem(false)]  // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。   [System.Web.Script.Services.ScriptService]  public class UserValidate : System.Web.Services.WebService  {    DFHon.Content.Common.rootPublic rp = new DFHon.Content.Common.rootPublic();    [WebMethod]    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]    public string ValidateUserLogState()    {      string result = "";      HttpCookie cookie = HttpContext.Current.Request.Cookies["DHFonMenberInfo"];      if (cookie != null)      {        string username = System.Web.HttpUtility.UrlDecode(cookie["MenberName"]);        int ipoint = 0;        int gpoint = 0;        try        {          DataTable dt = UserBll.ExecuteUserAllInfo(username);          if (dt.Rows.Count > 0)          {            ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString());            gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString());          }        }        catch        { }        result = "{'user':{'id':'" + cookie["UserId"] + "','name':'" + username + "','message':'" + rp.getUserMsg(DFHon.Global.CurrentCookie.UserName) + "','ipoint':'" + ipoint.ToString() + "','gpoint':'" + gpoint.ToString() + "'}}";      }      else      {        result = "{'user':{'id':'0','name':'','message':'0','ipoint':'0','gpoint':'0'}}";      }      return result;    }    [WebMethod]    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]    public string UserLogin(string userName, string userPwd)    {      string returnVal = "";      try      {        GlobalUserInfo info;        DFHon.Content.UserLogin _UserLogin = new DFHon.Content.UserLogin();        EnumLoginState state = _UserLogin.PersonLogin(HttpUtility.UrlDecode(userName), userPwd, out info);        if (state == EnumLoginState.Succeed)        {          DFHon.Global.CurrentCookie.Set(info);          DFHon.API.PDO.DiscuzNT.PassportLogin.UserLogin(Server.UrlDecode(userName), userPwd, -1);          int ipoint = 0;          int gpoint = 0;          DataTable dt = UserBll.ExecuteUserAllInfo(userName);          if (dt.Rows.Count > 0)          {            ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString());            gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString());          }          returnVal = "{'user':{'id':'" + info.UserId.ToString() + "','name':'" + info.UserName + "','message':'" + rp.getUserMsg(userName) + "','ipoint':'" + ipoint.ToString() + "','gpoint':'" + gpoint.ToString() + "'}}";        }        else        {          int ids = 0;//状态：-2用户被锁定 -1用户名密码错误          switch (state)          {            case EnumLoginState.Err_Locked:              ids = -2;              break;            case EnumLoginState.Err_UserNameOrPwdError:              ids = -1;              break;            default:              break;          }          returnVal = "{'user':{'id':'" + ids + "','name':'','message':'0','ipoint':'0','gpoint':'0'}}";        }      }      catch      {        returnVal = "{'user':{'id':'0','name':'','message':'0','ipoint':'0','gpoint':'0'}}";      }      return returnVal;    }    [WebMethod]    public string UserLogout()    {      if (HttpContext.Current.Request.Cookies["DHFonMenberInfo"] != null)      {        HttpCookie cookie = new HttpCookie("DHFonMenberInfo");        cookie.Expires = System.DateTime.Now.AddDays(-1);        cookie.Domain = DFHon.Config.BaseConfig.getV("weblogin");        HttpContext.Current.Response.AppendCookie(cookie);      }      return "1";    }    DFHon.Content.user UserBll = new DFHon.Content.user();    [WebMethod]    public string ValidateUserEmail(string email)    {      string result = "0";//返回的结果 -2邮箱为空 -1邮箱格式不正确 0邮箱存在 1填写正确      if (string.IsNullOrEmpty(email))      {        result = "-2";//邮箱为空      }      else if (!IsValidEmail(email))      {        result = "-1";//邮箱格式不正确      }      else if (UserBll.sel_useremail(email) > 0)      {        result = "0";//邮箱存在      }      else      {        result = "1";//可以注册      }      return result;    }    [WebMethod]    public string ValidateUserName(string username)    {      string result = "0";//返回值：-1用户名长度为2-16;0用户名存在;1可以注册      if (username == "" || username == null || username.Length < 2 || username.Length > 16)      {        result = "-1";      }      else if (UserBll.sel_username(username) != 0)      {        result = "0";      }      else      {        result = "1";      }      return result;    }    public bool IsValidEmail(string strIn)    { // Return true if strIn is in valid e-mail format.       return System.Text.RegularExpressions.Regex.IsMatch(strIn, @"^([/w-/.]+)@((/[[0-9]{1,3}/.[0-9]{1,3}/.[0-9]{1,3}/.)|(([/w-]+/.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(/]?)$");    }  }

<script>    $(function() {      $("#userloging").show();      //登录框处理开始      //加载登录状态      $.ajax({        type: "POST", //访问WebService使用Post方式请求        contentType: "application/json;charset=utf-8", //WebService 会返回Json类型        url: "/API/Service/UserValidate.asmx/ValidateUserLogState", //调用WebService        data: "{}", //Email参数        dataType: 'json',        beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },        error: function(x, e) { },        success: function(response) { //回调函数，result，返回值          $("#userloging").hide();          var json = eval('(' + response.d + ')');          var userid = json.user.id;          if (userid > 0) {            $("#spanusername").html(json.user.name);            $("#spanmessagenum").html(json.user.message);            $("#userloginsucced").show();            $("#userloginbox").hide();          }        }      });      //登录      $("#userlogbutton").click(function() {                var username = $("#username").val();        var userpwd = $("#userpassword").val();        if (username != "" && userpwd != "") {          $("#userloging").show();          $.ajax({            type: "POST", //访问WebService使用Post方式请求            contentType: "application/json;charset=utf-8", //WebService 会返回Json类型            url: "/API/Service/UserValidate.asmx/UserLogin", //调用WebService            data: "{userName:'" + username + "',userPwd:'" + userpwd + "'}", //Email参数            dataType: 'json',            beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },            error: function(x, e) {            },            success: function(result) { //回调函数，result，返回值              $("#userloging").hide();              var json = eval('(' + result.d + ')');              var userid = json.user.id;              if (userid > 0) {                $("#spanusername").html(json.user.name);                $("#spanmessagenum").html(json.user.message);                $("#userloginsucced").show();                $("#userloginbox").hide();              }              else {                switch (userid) {                  case -2:                    alert("用户被锁定！请30分钟后再登录！");                    $("#username").focus();                    break;                  case -1:                    alert("用户名或密码错误！请核对您的用户名和密码！");                    $("#userpassword").focus();                    break;                  default:                    alert("登录失败！请核对您的用户名和密码之后重试！");                    $("#userpassword").focus();                    break;                }              }            }          });        }        else if (username == "") {          alert("用户名不能为空！");          $("#username").focus();        }        else if (userpwd == "") {          alert("密码不能为空！");          $("#userpassword").focus();        }      });      //退出      $("#logout").click(function() {        $("#userloging").show();        $.ajax({          type: "POST", //访问WebService使用Post方式请求          contentType: "application/json;utf-8", //WebService 会返回Json类型          url: "/API/Service/UserValidate.asmx/UserLogout", //调用WebService          data: "{}", //Email参数          dataType: 'json',          beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },          success: function(result) { //回调函数，result，返回值            $("#userloging").hide();            if (result.d > 0) {              $("#userloginsucced").hide();              $("#userloginbox").show();            }          }        });      }); //登录框处理结束    });    </script>