jquery_ajax请求出错，睡不着，求鉴定


$(document).ready(function(){
              //获取登录按的事件并激活click事件
            $('#btn_ent_login').click(function(){
                 chacklogin();      
            });
        });
        
    function chacklogin()
   {
     var loginid=$('#txtloginid').val();
     var pwd=$('#txtpass').val();
     if(loginid.length ==0){alert('登录账号不能为空!');$('#txtloginid').focus();return;}
     if(pwd.length ==0){alert('请输入登录密码!');$('#txtpass').focus();return;}
  
     var strHtml = "<br/><center><span style='width:100%;padding-left:20px'><br/>正在登陆ing...<img src=images/loading.gif />请稍候</span></center>";
     var pop=new Popup({ contentType:2,isReloadOnClose:false,width:328,height:123});
     pop.setContent("contentHtml",strHtml);
     pop.setContent("title","提示!");
   
   $.ajax({
     type: 'POST',
     url: 'vldlogin.aspx',
     data: { type: "ent", loginid: "[email protected]" ,pwd:"[email protected]"}, //'type=ent&loginid='+loginid+'&pwd='+pwd,
     dataType:'json',
     beforeSend:function(){pop.build(); pop.show();},
     error: function() { alert("连接出现错误") ; pop.close();},
     success:function(data)
             {
                   //1表示成功
                   if(data.sta==1)
                   {
                       window.location.href="ent/index.aspx";
                   }
                   else
                   {
                      alert(data.info);                   
                   }
            }
     });
    }if (Request.Params["type"] == "ent")//企业用户
            {
                if (Request.Params["loginid"] != null && Request.Params["pwd"] != null)
                {
                    string loginid = Request.Params["loginid"].ToString().Trim();
                    string pwd = Request.Params["pwd"].ToString().Trim();
                    
                    if (Common.xz_Expression.isEmail(loginid))
                    {
                       
                            heyjob.Model.b_EntUser modelE = new heyjob.Model.b_EntUser();
                            modelE = bllE.GetModel(loginid, Common.xz_MD5.MD5(pwd));
                            if (modelE != null)
                            {
                                Session["ent"] = modelE;
                                Response.Write(CreareJson("登录成功!", 1));
                            }
                            else
                            {
                                Response.Write(CreareJson("用户名或密码错误!", 2));
                            }
                     }                                             
                   }
                    else
                    {
                        Response.Write(CreareJson("账号格式不对!", 3));
                    }
                   
                }
                else
                {
                    Response.Write(CreareJson("登录失败!", 0));
                }
                Response.End();
是请求出错，貌似都没去到这个请求页,求解决！！