function Ajax(url,recvT,stringS,resultF) {
    this.url = url;
    this.stringS = stringS;
    this.xmlHttp = this.createXMLHttpRequest();
    if (this.xmlHttp == null) {
        alert("erro");
        return;
    }
    var objxml = this.xmlHttp;
    objxml.onreadystatechange = function (){Ajax.handleStateChange(objxml,recvT,resultF)};
}

Ajax.prototype.createXMLHttpRequest = function() {
    try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
    try { return new ActiveXObject("Msxml2.XMLHTTP");    } catch(e) {}
    try { return new XMLHttpRequest();                   } catch(e) {}
    return null;
}

Ajax.prototype.createQueryString = function () {
    var queryString = this.stringS;
    return queryString;
}

Ajax.prototype.get = function () {
    url = this.url;
    var queryString = url+"?timeStamp=" + new Date().getTime() + "&" + this.createQueryString();
    this.xmlHttp.open("GET",queryString,true);
    this.xmlHttp.send(null);
}

Ajax.prototype.post = function() {
    url = this.url;
    var url = url + "?timeStamp=" + new Date().getTime();
    var queryString = this.createQueryString();
    this.xmlHttp.open("POST",url,true);
    this.xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    this.xmlHttp.send(queryString);
}
    
Ajax.handleStateChange = function (xmlHttp,recvT,resultF) {
    if (xmlHttp.readyState == 4) {
        if (xmlHttp.status == 200) {
        resultF(recvT?xmlHttp.responseXML:xmlHttp.responseText);
        } else {
        alert("ÍøÂçÁ¬½Ó³¬Ê±!");
        }
    }
}