AJAX制作JSON格式的局部实时更新数据的方法

  <script type="text/javascript">
                $(function () {
                    var i = 0;
                    function setTimeOutPost() {
                        $.ajax({
                            type: "post",
                            url: "/UserControl/DoData.ashx",
                            dataType: "json",
                            success: function (msg) {
                                $("#ShowData").html(msg[0].getInfo+i++);
                                setTimeout(setTimeOutPost, 1000);
                            },
                            error: function (req) {
                                alert(req.readyState);
                            }
                        });
                    }
                    setTimeOutPost();
                });
               
            </script>

 context.Response.ContentType = "application/json";

string obj = "[{\"getInfo\":\""+Info[0]+"\"}]";
                context.Response.Write(obj);