jqeury eval将字符串转换json的方法

$.ajax({
type: "post",
contentType: "application/json",
url: "../WebForm1.aspx/GetRightsStr",
dataType: "json",
success: function (msg) {
alert(msg.d);
var data = eval("(" + msg.d + ")");
$.each(data.rights, function (index, item) {
alert(item.RightsName);
});
},
error: function (e, s, d) {
alert(e);
alert(s);
alert(d);
}
});

/// <summary>
/// DataTable转成Json
/// </summary>
/// <param name="jsonName">josn名称</param>
/// <param name="dt">要转换的数据集</param>
/// <returns></returns>
public static string DataTableToJson(string jsonName, DataTable dt)
{
StringBuilder Json = new StringBuilder();
Json.Append("{\"" + jsonName + "\":[");
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Json.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"");
if (j < dt.Columns.Count - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < dt.Rows.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}