用jQuery的$.each步骤无法解析WebServers返回的JSON _Web Service

用jQuery的$.each方法无法解析WebServers返回的JSON
通过jQuery的Ajax方法获取到WebServers返回的JSON数组，但是通过each方法解析时，获得的数据始终是undefined.

通过FireBug查看返回的数据是正确的，数据内容是：{"d":"[{id:2,Name:\u0027维生素A\u0027,Introduction:\u002712466说\u0027,Time:\u00272012/10/7 19:27:00\u0027}]"} 通过json.d也可以获取到数据，就是使用each方法无法遍历，在遍历的时候，用alert(this)，显示的数据和json.d显示的一样，感觉完全没有分拆样
代码如下
Websevers代码

C# code


public string NutrientsList()
        {
            string result = string.Empty;
            IList<NutrientsInfo> info = new List<NutrientsInfo>();
            info = nut.INutrientsAllList();
            if (info.Count < 1)
            {
                result = "null";
            }
            else
            {
                result = "[";
                for (int i = 0; i < 1; i++)
                {
                    result += "{id:" + info[i].ID + ",Name:\'" + info[i].Name + "\',Introduction:\'" + info[i].Introduction + "\',Time:\'" + info[i].CreatTime + "\'}";
                    result += ",";
                }
                result = result.TrimEnd(',');
                result += "]";
            }
            return result;
        }

jQuery代码

JScript code


$.ajax({
        type: "POST",
        contentType: "application/json;utf-8",
        dataType: "json",
        url: "../CookBook/Nutrients.asmx/NutrientsList",
        data: "{}",
        beforeSend: function () {
            $("#NutrientsList").empty().html("<div style=\"text-align:center\">正在读取菜谱！<\/div>");
        },
        success: function (result) {
            if (result == "null") {
                $("#NutrientsList").empty().html("<div style=\"text-align:center\">没有找到营养素！<\/div>");
            }
            else {
                var json = eval(result);
                var html = "";
                html += "<table class=\"data-table\" width=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\r\n";
                html += "<tbody>\r\n";
                html += "<tr>\r\n";
                html += "<th scope=\"col\"><input value=\"true\" type=\"checkbox\" title=\"全选/不选\" onclick=\"CheckBox.CheckAll(this);\" name=\"CheckAll\" id=\"CheckAll\" /><input value=\"false\" type=\"hidden\" name=\"CheckAll\" /></th>\r\n";
                html += "<th scope=\"col\">营养素名称</th>\r\n";
                html += "<th scope=\"col\">营养素介绍</th>\r\n";
                html += "<th scope=\"col\">创建时间</th>\r\n";
                html += "<th scope=\"col\">编辑</th>\r\n";
                html += "<th scope=\"col\">删除</th>\r\n";
                html += "</tr>\r\n";
                $.each(json, function () {
                    html += "<tr>\r\n";
                    html += "<td class=\"chk\"><input value=\"true\" type=\"checkbox\" rel=\"2\" name=\"CheckBox\" class=\"check-box\" /><input value=\"false\" type=\"hidden\" name=\"CheckBox\" /></td>\r\n";
                    html += "<td class=\"txt80 c\"><a href=\"#\" title=\"查看资料\">" + this.Name + "</a></td>\r\n";
                    html += "<td class=\"txt200 c\">" + this.Introduction + "</td>\r\n";
                    html += "<td class=\"txt80 c\">" + this.Time + "</td>\r\n";
                    html += "<td class=\"icon\"><a class=\"opt\" title=\"编辑\" href=\"#\"><span class=\"icon-sprite icon-edit\"></span></a></td>\r\n";
                    html += "<td class=\"icon tail\"><a class=\"opt\" title=\"删除\" href=\"javascript:DeleteById(2);\"><span class=\"icon-sprite icon-delete\"></span></a></td>\r\n";
                    html += "</tr>\r\n";
                    alert(this);
                });
                $("#NutrientsList").empty().html(html);
            }
        }
    });