求教jquery读取json数组undefined的问题

各位，小弟请教个问题

我在前台通过jquery ajax访问后台，读取数据库，返回查询结果列表，前台在获取这个json数组的时候，取到的值都是undefined的，请问是怎么回事？应该怎么写？代码如下


js

$(document).ready(function() {

 $("#btn").click(function(){   

		$.ajax( {

	        url : "test.action",  // 数据发送方式

	        type : "post",

	        dataType : "json",// 接收数据格式

	        timeout : 20000,// 设置请求超时时间（毫秒）。

	        success : function(data) { // 请求成功后回调函数。

		  		//读取权限等信息再跳转页面

	        	var d = eval("("+data+")");

				 $.each(result, function (i, n) {

                 alert(n.user_no);

           		 });

//	  			 $.each(d, function(i, item) {

//            	 $("#info > ul").append("<li>" + item.user_no +"---------"+item.last_login_time+"</li>");

//	  			 })

        

	         },

	  	   error : function(e) {

     			 alert(e);

     		}

        })

    })

})

后台java代码

package com.sunyard.cop.ccs.action;



import java.util.ArrayList;

import java.util.HashMap;

import java.util.Map;



import net.sf.json.JSONArray;

import net.sf.json.JSONObject;



import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionContext;

import com.sunyard.cop.ccs.common.SQLExecutor;

import com.sunyard.encrypt.impi.EncryptImp;



public class TestAction implements Action {



	

	Map<String,String> map = new HashMap<String,String>();

	

	private JSONArray list;//我要返回给页面的List 

	private String result;

	

	public String execute() throws Exception {

		// TODO Auto-generated method stub

		SQLExecutor dbHelper = new SQLExecutor();

		dbHelper.open();

		String querySql = "select * from sm_users_tb";

		ArrayList array = dbHelper.queryForList(querySql, null);

		list = new JSONArray();

	    list=JSONArray.fromObject(array); 

		System.out.println("list:"+list);

		return SUCCESS;

	}

	



	public JSONArray getList() {

		return list;

	}





	public void setList(JSONArray list) {

		this.list = list;

	}





	public String getResult() {

		return result;

	}

	

	public void setResult(String result) {

		this.result = result;

	}





}

其中后台的返回 list 控制台输出的内容为

[

		{"TELLERLVL":1,"LOGIN_STATE":5,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"admin","USER_NAME":"系统超级管理员","ORGAN_NO":"000000","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20121220164126","PASSWORD":"66UbaZVbHvA=","USER_STATUS":0},

		{"TELLERLVL":0,"LOGIN_STATE":99,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000001","USER_NAME":"系统参数管理员","ORGAN_NO":"000001","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"WWzeO3tPUHo=","USER_STATUS":0},

		{"TELLERLVL":2,"LOGIN_STATE":99,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"sunds","USER_NAME":"业务参数管理员","ORGAN_NO":"000001","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"aDN18k+Z9xU=","USER_STATUS":1},

		{"TELLERLVL":1,"LOGIN_STATE":98,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000000","USER_NAME":"综合管理员","ORGAN_NO":"000001","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20121220164126","PASSWORD":"4K48Oeeq1B8=","USER_STATUS":0},

		{"TELLERLVL":1,"LOGIN_STATE":98,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000002","USER_NAME":"柜员2","ORGAN_NO":"000001","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"MZHMgKIx/wE=","USER_STATUS":0},

		{"TELLERLVL":6,"LOGIN_STATE":99,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000003","USER_NAME":"柜员3","ORGAN_NO":"000001","USER_ENABLE":"0","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"Yl0u/AYbePY=","USER_STATUS":0},

		{"TELLERLVL":3,"LOGIN_STATE":98,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000004","USER_NAME":"柜员4","ORGAN_NO":"20001","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"3F2zGT4dOKg=","USER_STATUS":0},

		{"TELLERLVL":7,"LOGIN_STATE":99,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000005","USER_NAME":"柜员5","ORGAN_NO":"20001","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"t6ij5i/b30E=","USER_STATUS":0},

		{"TELLERLVL":5,"LOGIN_STATE":99,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000006","USER_NAME":"柜员6","ORGAN_NO":"20002","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"a4B186C2ieo=","USER_STATUS":0},

		{"TELLERLVL":6,"LOGIN_STATE":99,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000007","USER_NAME":"柜员7","ORGAN_NO":"20002","USER_ENABLE":"2","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"NmxKYXsLhfE=","USER_STATUS":0},

		{"TELLERLVL":7,"LOGIN_STATE":98,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000008","USER_NAME":"柜员8","ORGAN_NO":"20003","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"1uhqZ8NEqNI=","USER_STATUS":0},

		{"TELLERLVL":8,"LOGIN_STATE":5,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000009","USER_NAME":"柜员9","ORGAN_NO":"20003","USER_ENABLE":"0","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"P0pyNC7MGuE=","USER_STATUS":0},

		{"TELLERLVL":9,"LOGIN_STATE":98,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000010","USER_NAME":"柜员A","ORGAN_NO":"20004","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"otNA3VDC6CY=","USER_STATUS":0},

		{"TELLERLVL":4,"LOGIN_STATE":5,"LOGIN_MODE":"1","LAST_LOGIN_TIME":"20121220101010","USER_NO":"000011","USER_NAME":"柜员B","ORGAN_NO":"20004","USER_ENABLE":"1","LAST_LOGOUT_TIME":"20121220111111","LAST_MODI_DATE":"20120514155225","PASSWORD":"E1Xmv+0Hq+A=","USER_STATUS":0}

		]

请高人指点，小弟不胜感激