js使用ajax傳值給后臺,后臺返回字符串處理方法

<code class="language-html"><input type="text" id="iusername" runat="server" onblur="tbox_click()"/> 
<input id="inadd" runat="server" type="text" /> 
<input id="intel" runat="server" type="text" /></code> 

<script>
 function tbox_click() {
 var cc = document.getElementById("iusername").value;
 var jsonob = {tbname:cc};
 $.ajax({
 type: "Post",
 url: "tc.aspx/Tbclick",
 contentType: "application/json; charset=utf-8",
 dataType: "text",
 data: JSON.stringify(jsonob),
 success: function (data) {
 var a = eval("(" + data + ")");
 var al = a.d;
 if (al == "namenull") {
 alert("The user name does not exist. Please re-enter it(該用戶名不存在，請重新輸入)");
 return;
 }
 if (al == "null") {
 alert("Please input OBTUsername(請輸入用戶名)");
 return;
 }
 //alert(a.d);
 var myd = new Array();
 myd = a.d.split("|");
 $("#intel").val(myd[0]);
 $("#inadd").val(myd[1]);
 },
 error: function (e) {
 alert(e.message);
 }
 });
 }
 </script>

[WebMethod]
 public static string Tbclick(string tbname)
 {
 if (tbname.Trim() == "")
 {
 return "null";
 }
 var user = new User(tbname.Trim());//這個是根據tbname從數據庫中獲取信息的方法，可以自行填寫
 if (user.userName == null)
 {
 return "namenull";
 }
 string jsonText = user.mobile+"|"+user.address;
 
 return jsonText;
 }

var aa = eval("(" + data.d + ")");
alert(aa);

var a = eval("(" + data + ")");
alert(a.d);