<script>
var xmlHttp;
function createXmlRequest() {
    if(window.ActiveXObject){
          var xmlHttps=["MSXML2.XMLHttp.5.0","MSXML2.XMLHttp4.0",
                        "MSXML2.XMLHttp3.0","MSXML2.XMLHttp","Microsoft.XMLHTTP"];
    try{
        for(var i=0;i<xmlHttps.length;i++){
               var xmlHttp=new ActiveXObject(xmlHttps[i]);
               return xmlHttp;
        }
     }
     catch (error){
      }
             
   }
    else{
        var xmlHttp=new XMLHttpRequest();
        return xmlHttp;
    }
          throw    new Error("失败");
}
           
function insert(){
     xmlHttp=createXmlRequest();
     xmlHttp.onreadystatechange=handleStateChange;
     xmlHttp.open("GET","Handler.ashx?user="+document.getElementById("txtUser").value+"",true);
     xmlHttp.send(null);
}
function handleStateChange(){
    if(xmlHttp.readyState==4){
         if(xmlHttp.responseText=="Y")alert("success");
         else alert("faile");
    }
}
</script>
<input type="text" id="txtUser" />
<input type="button" id="d" onclick="test();" />