客户端：
<script type="text/javascript"> window.onload = initPage; function initPage() { var btn = document.getElementById("btnOK"); btn.onclick = function () { getDetails(this.title);//按钮单击发送请求 } } function getDetails(obj) { request = createRequest(); //创建请求对象 if (request == null) { alert("没有请求对象！"); return; } var url = "DetailForm.aspx?title=" + escape(obj);//向何处发请求 request.open("GET", url, true); //请求方式 request.onreadystatechange = displayDetails;//函数引用，设置回调函数 request.send(null);//没有随请求发送额外东西 } function displayDetails() { if (request.readyState == 4) { if (request.status == 200) { document.getElementById("btnOK").value = request.responseText; } } } function createRequest() { try { request = new XMLHttpRequest(); } catch (tryMS) { try { request = new ActiveXObject("Msxml2.XMLHTTP"); } catch (otherMS) { try { request = new ActiveXObject("Microsoft.XMLHTTP"); } catch (failed) { request = null; } } } return request; } //完全看不到页面的刷新，却从服务器端拿回了数据！ </script>
<body> <form id="form1" runat="server"> <div> <input type="button" id="btnOK" value="Ok" title="确定" /> </div> </form> </body>
服务端：
public partial class DetailForm : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string str = Request.QueryString["title"]; if (str != null && str != "") { Response.Write("new_" + str); } else { Response.Write("nothing"); } Response.End(); } }