Javascript 闭包访问问题？

function pfajax(paradata){
            $.ajax({
                    data : paradata.dat,
                    type : paradata.method,
                    async: false,
                    url : "http://222.192.41.119:8080/info/android/"+paradata.url,
                    dataType : "jsonp",//数据类型为jsonp
                    jsonp: "jsonpCallback",//服务端用于接收callback调用的function名的参数
                    contentType : "application/json; charset=utf-8",
                    success : function(ret){
                            var object = JSON.parse(decodeURIComponent(ret));
                            paradata.sucfunction(object);
                            //console.log(object.adminname);
                            //alert(object);
                            },
                    error:function(){
                            alert('fail');
                            }
                    });
        }

function mainupdte() {
		    var jfid = 1;
			var senddat = {};
            senddat.url = "area";
            senddat.dat = {};
            senddat.method = 'get';
            senddat.sucfunction = function(ret){
                    jfid = ret[0].jfid;                  //★★我想获取这里的jfid怎么破？？？
                    for(var i = 0;i<ret.length;i++){
					     var option = $("<option jfid='"+ret[i].jfid+"'>"+ret[i].address+"</option>");
					     $("#frame0 select").append(option);
					  }
					return jfid;
            }
            pfajax(senddat);
		}

//jquery ready function
$(function(){
            var getjfidfun = mainupdte();
            selectchange(jfid);
        });