前台js：

 var treeNodes;

 $.ajax({

     async: false,

     cache: false,

     type: 'POST',

     contentType: "application/json",

     url: "/MsgTypeTemItem/GetAllStr?temId=" + $("#temId").val(), //请求的action路径

     error: function () {//请求失败处理函数

          alert('请求失败');

     },

     success: function (data) { //请求成功后处理函数

          data = "[" + data + "]";

          treeNodes = eval(data);//格式化（object）数据

     }

 });

 $.fn.zTree.init($("#treeDemo"), setting, treeNodes);

 后台Controller：

 public string GetAllStr()

         {

             string temId = Request.QueryString["temId"];

             List<MsgTypeTemItem> allList = msgTypeItemService.GetAll();

             string querySql = "select * from MessageTempletItem where TempletId='" + temId + "'";

             DataTable dt = sqlHelper.GetDataTable(querySql);

             string result = string.Empty;

             foreach (DataRow dr in dt.Select("FatherId='0'"))

             {

                 result += AppendJson(dr, dt);

             }

             int index = result.LastIndexOf("\r\n");

             if (result.Length > )

                 result = result.Substring(, index - );

             return result;

         }

         private static string AppendJson(DataRow dr, DataTable dtAll)

         {

             string parentNode = string.Empty;

             string isTrue = "false";

             parentNode = "{id:\'{id}\', pId:\'{pId}\', name:\'{name}\', open:" + isTrue + ", drag:true" + "},\r\n";

             parentNode = parentNode.Replace("{id}", dr["ItemId"].ToString()).Replace("{pId}", dr["FatherId"].ToString()).Replace("{name}", dr["ItemContent"].ToString());

             DataRow[] rows = dtAll.Select("FatherId='" + dr["ItemId"].ToString().Trim() + "'");

             if(rows.Length!=)

             {

                 foreach (DataRow row in rows)

                 {

                     parentNode += AppendJson(row, dtAll);

                 }

             }

             return parentNode;

         }

 注意：①.要后台数据进行eval（object化）--eval

 eval前：[{id:'y1',pId:'',name:'y1',drag:true},{id:'y11',pId:'y1',name:'y11',drag:true},{id:'y2',pId:'',name:'y2',drag:true}]

 eval后：[object Object],[object Object],[object Object]
相关知识点①：eval
var code1='"a" + 2'; //表达式 
var code2='{a:2}'; //语句 
var code3=[{a:1,b:2},{a:2,b:3}];
alert(eval(code1)); //->'a2' 
alert(eval(code2)); //->undefined 
alert(eval('(' + code2 + ')')); //->[object Object] 
alert(eval(code3));//->[object Object],[object Object]