解析json格式数据，要求有些难。

解析json格式数据，要求有点难。。。。。
var str={"act":"{\"act\":\"inittemplate\",\"titleid\":\"2\"}","newName":null,"obj":[{"titleid":2,"titlename":"医疗产品","tsid":1,"tsname":"自动注射器","tssid":1,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":1,"tsname":"自动注射器","tssid":2,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"史密斯输液器"},{"titleid":2,"titlename":"医疗产品","tsid":2,"tsname":"血压器","tssid":3,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":2,"tsname":"血压器","tssid":4,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":3,"tsname":"血糖仪","tssid":5,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":3,"tsname":"血糖仪","tssid":6,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"}]}

上面的是json格式数据

var data2 = eval("(" + str + ")");
var jsonstring2 = data2.obj;
var tempids = "";
for (i in jsonstring2) {
                        jsonstring2[i].tsname//这个地方等得到值，
}
需求是：  要把json解析成
"tsid":2 "tsname":"血压器"
      "tssid":4   "tssname":"比杨单通道注射泵BYZ-810"
      "tssid":3   "tssname":"比杨单通道注射泵BYZ-810"
"tsid":1,"tsname":"自动注射“
     "tssid":2  "tssname":"史密斯输液器"
     "tssid":1  "tssname":"比杨单通道注射泵BYZ-810"

怎么把得到的结果转换成这个样子，请大侠给出代码···········
       
------解决方案--------------------
我想问下楼主，你这是前台数据，干嘛还要这样取
如果是从后台传过来的数据的话，就用ajax的Json传值，这样好解析些


你可以像如下方法取得你需要的几个值

var obj = msg.obj;

for(int i=0;i<obj.length,i++){

var titleid = obj[i].titleid;

var titlename = obj[i].titleid;

...

}

------解决方案--------------------

引用:

引用:你在append的时候先判断改tsname在<h2>标签中是否已经存在 存在则将该tssname apend到该tsname下面  
否则则新创建一个<h2>标签给个代码，我取不出来

效果图

代码

	  <script type="text/javascript">

	  	$(function(){

	  		//$('#tt').tree({

	  		//	url:'EnergyAction!doTree.action'

	  		//});

	  		var str={"act":"{\"act\":\"inittemplate\",\"titleid\":\"2\"}","newName":null,"obj":[{"titleid":2,"titlename":"医疗产品","tsid":1,"tsname":"自动注射器","tssid":1,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":1,"tsname":"自动注射器","tssid":2,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"史密斯输液器"},{"titleid":2,"titlename":"医疗产品","tsid":2,"tsname":"血压器","tssid":3,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":2,"tsname":"血压器","tssid":4,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":3,"tsname":"血糖仪","tssid":5,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"},{"titleid":2,"titlename":"医疗产品","tsid":3,"tsname":"血糖仪","tssid":6,"tssimg":"\/cy\/images\/byz01.jpg","tssname":"比杨单通道注射泵BYZ-810"}]};


	  		var jsonstring2 = str.obj;