ZTREE ajax后台怎么传递text类型的数据?

[火星大能猫]

json的没问题,但是我想直接传递text格式的数据
始终有问题.

 var tree;      
    var setting = {
        data: {
            simpleData: {
                enable: true
            }
        }
    };
    //var zNodes = [{ id: 1, pId: 0, name: "展开、折叠 自定义图标不同"}];
     $(function () {
            $.ajax({
                type: "Get",
                url: "GetLeftMenu",
                //async: false,
                success: function (data) {                 
                    alert(tree);
                    $.fn.zTree.init($("#treeDemo"), setting, tree);
                }
            });
        })

    //$(document).ready(function () {
    //    $.fn.zTree.init($("#treeDemo"), setting, Data);
    //});
   

    </script>

后台代码生成的字符串
[{id: 1, pId: 0, name: "测试数据"}]

  public string GetLeftMenu()
        {
            {
                StringBuilder sbb = new StringBuilder();
                    sbb.Append("");
                    sbb.Append("[{id: 1, pId: 0, name: \"测试数据\"}]");
//                     sbb.Append("{ id: 2, pId: 1, name: \"ch1\" },");
//                     sbb.Append("{ id: 3, pId: 1, name: \"ch2\" },");
//                     sbb.Append("{ id: 4, pId: 3, name: \"ch3\" },");
//                     sbb.Append("{ id: 5, pId: 0, name: \"root2\" },");
//                     sbb.Append("{ id: 6, pId: 5, name:\"root2\" }");
                    sbb.Append("");
                    return sbb.ToString();
            }