AJAX展現註冊使用者即時檢測的問題..

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前台代碼：<script><br />var xmlHttp = false;<br />try {<br />xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");<br />} catch (e) {<br />try {<br />xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");<br />} catch (e2) {<br />xmlHttp = false;<br />}<br />}<br />if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {<br />xmlHttp = new XMLHttpRequest();<br />}<br />function callServer() {<br />var u_name = document.getElementById("username").value;<br />if ((u_name == null) || (u_name == "")) return;<br />var url = "cu.asp?name=" + u_name+ "&t="+new Date().getTime();<br />xmlHttp.open("GET",url,true);<br />xmlHttp.onreadystatechange = updatePage;<br />xmlHttp.send(null);<br />}<br />//如何將非同步擷取的資訊顯示在當前頁呢<br />function updatePage() {<br />if (xmlHttp.readyState < 4) {<br />test1.innerHTML="loading...";<br />}<br />if (xmlHttp.readyState == 4) {<br />var data = xmlHttp.responseText;<br />test1.innerHTML=data;<br />}<br />}<br /></script><br /><input type=text id ="username" name="username" onblur="callServer()"><div id="test1"></div>
   提示：您可以先修改部分代碼再運行

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後台代碼：
<%<br />Response.Charset="gb2312"<br />DbPath = "data.mdb"<br />Connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.Mappath(DbPath)<br />Set Conn = Server.CreateObject("Adodb.Connection")<br />Conn.Open Connstr<br />on error resume next<br />username=trim(request.QueryString("name"))<br />set rs=server.createObject("adodb.recordset")<br />sql="select * from user where u_name='"&username&"'"<br />'response.Write sql<br />'response.End()<br />rs.Open sql,conn,1,1<br />if rs.eof then<br />response.write("可以註冊")<br />else<br />response.write("已被註冊")<br />end if<br />rs.close:set rs=nothing<br />%>
   提示：您可以先修改部分代碼再運行