问Ajax请求未传递给控制器

EN

function getStates(){
    var httpRequest;
    var country = document.getElementById('countryName');
    alert(country);
    var url = '/developer/register.htm';

    url = url + (url.match(new RegExp('\\?')) ? '&isAjax=true' : '?isAjax=true');

     if (window.ActiveXObject)
     {
         httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
     }
     else if (window.XMLHttpRequest)
     {
         httpRequest = new XMLHttpRequest();
     }

     httpRequest.open("GET", url, true);
     httpRequest.onreadystatechange = function() {processRequest(); };
     httpRequest.send(null);
}

function processRequest() {
    if(httpRequest.readyState == 4){
        alert("inside ready state");
        var response = http.responseText;
        document.getElementById('states').innerHTML = response;
    }
}