ajax向ashx请求json数据

<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
    <script type="text/javascript">
            $(function(){
                    //1.返回数据类型 dataType: 'json'
                    //2.传递的数据格式 为空时:data: {}, 不为空时:data: {username:"Lee"},
                    //3.返回的json数据格式 单条数据:{"key","value"} , 多条数据:[{"key","value"},{"key","value"}]
                    $.ajax({
                        async:true,
                        type:"POST",
                        contentType: "application/json",
                        dataType: 'json',   //返回数据类型
                        url: "1.ashx",
                        data: {},
                        //data: {username:username},
                        success: function(msg) {
                            alert(msg);
                            for(i=0;i<msg.length;i++)
                            {
                                $("#rt").append(msg[i].name+"__"+msg[i].age+"<br/>");
                            }
                            
                        },
                        error: function(){alert("error");}
                    }); 
            });
    </script>

<div id="rt">
    
    </div>

 

context.Response.Cache.SetNoStore();
            StringBuilder returnValue=new StringBuilder();
            returnValue.Append("[");
            returnValue.Append("{\"name\":\"Lee\",\"age\":\"28\"},");
            returnValue.Append("{\"name\":\"Lucy\",\"age\":\"25\"}");
            returnValue.Append("]");
            context.Response.Write(returnValue.ToString());