<div style="margin: 0 auto">

         <input type="text" id="wenxiantxt" onkeyup="ClickEvent()" style="width: 250px; height: 25px" />

         <ul id="all" style="width:250px;height: auto; margin-top: 0px;">

         </ul>

     </div>

 [WebMethod]

         public static string GetJson(string urls)

         {

             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urls);

             request.Method = "GET";

             request.ContentType = "application/json; charset=utf-8";

             HttpWebResponse response = (HttpWebResponse)request.GetResponse();

             Stream myResponseStream = response.GetResponseStream();

             StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);

             string retString = myStreamReader.ReadToEnd();

             myStreamReader.Close();

             myResponseStream.Close();

             return retString;

         }

<style type="text/css">

        ul li

        {

            list-style: none;

            font-size: 12px;

            text-decoration: none;

            color: gray;

            cursor: pointer;

            padding: 0px;

            margin-left: -35px;

        }

  </style>

 <script type="text/javascript">

        function ClickEvent() {

            urls = "http://www.suggest?&q=hiv&src=cn";

            $.ajax({

                type: "Post",

                async: false,

                url: "2_sousuotishi.aspx/GetJson",

                contentType: "application/json; charset=utf-8",

                data: "{urls:'" + urls + "'}",

                dataType: "json",

                success: function (data) {

                    var jsondata = eval("(" + data.d + ")");

                    $("#all").empty();

                    //debugger;

                    for (var i = ; i < jsondata['data'].length; i++) {

                        var html2 = "";

                        html2 += "<li>" + jsondata['data'][i] + "</li>";

                        $("#all").append(html2);

                    }

                    //选择搜索提示的文本到搜索框

                    $("li").on("click", function () {

                        $("#wenxiantxt").val($(this).text());

                        $("#all").html("");

                    });

                    $("li").mousemove(function () {

                        $("li").css("background-color", "");

                        $(this).css("background-color", "gray");

                        $("li").css("color", "gray");

                        $(this).css("color", "white");

                    });

                },

                error: function (err) {

                    alert("error！");

                }

            });

        }

    </script>