AJAX asp 查询数据库并得到返回值

function checkdomain(){
                var domain = document.getelementbyid("domain").value;
                if(domain == ''){
                    alert("请填写域名！");
                    document.getelementbyid("domain").focus();
                    return false;
                }
                var info=domain.match(/^[a-z0-9]+$/);
                if(!info){
                    alert("域名必须是字母和数字组成！");
                    document.getelementbyid("domain").focus();
                    return false;
                }else{
                    var xml=window.activexobject ? new activexobject("microsoft.xmlhttp") : new xmlhttprequest();
                    xml.open('get','/index.asp?r=company/checkdomain&domain='+domain,true);
                    xml.send('');
                    xml.onreadystatechange = function()
                    {
                        if(xml.readystate == 4 && xml.status == 200)
                        {
                            var result = xml.responsetext;
                            document.getelementbyid("result").innerhtml = result;
                        }
                    }
                }
            }

asp代码

<%
'-----------------------------------------------------------------
       dim username
       username=trim(request.form("username"))                     '接收ajax发送的参数
       if username="" then response.end()
'------------------------------------------------------------------
       set rs=server.createobject("adodb.recordset")
       sql="select * from test where username = '"&username&"'"
       rs.open sql,conn,1,1
'------------------------------------------------------------------
       '--------如果没有找到的话,返回0
       '--------如果找到的话,返回所有匹配的项目
       if not (rs.eof and rs.bof) then
    response.write(""&rs("time")&"")
       rs.close
       set rs=nothing
%>