function Ajax(sUrl,sRecvTyp,sQueryString,oResultFunc) {
    this.Url = sUrl;
    this.QueryString = sQueryString;
    this.XmlHttp = this.createXMLHttpRequest();
    if (this.XmlHttp == null) {
        alert("erro");
        return;
    }
    var objxml = this.XmlHttp;
    objxml.onreadystatechange = function (){Ajax.handleStateChange(objxml,sRecvTyp,oResultFunc)};
}

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

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

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

Ajax.prototype.post = function() {
    sUrl = this.Url;
    var sUrl = sUrl + "?timeStamp=" + new Date().getTime();
    var queryString = this.createQueryString();
    this.XmlHttp.open("POST",sUrl,true);
    this.XmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    this.XmlHttp.send(queryString);
}

Ajax.handleStateChange = function (XmlHttp,sRecvTyp,oResultFunc) {
if (XmlHttp.readyState == 4) {
    if (XmlHttp.status == 200) {
            oResultFunc(sRecvTyp?XmlHttp.responseXML:XmlHttp.responseText);
        } else {
            alert("您所請求的頁面有異常。");
        }
    }
}

/*使用方法
<script type="text/javascript">
    var classAjax = new Ajax(sUrl,sRecvTyp,sQueryString,oResultFunc);
    classAjax.post();//post方式發送數據
    classAjax.get();//get方式發送數據
    //sUrl發送地址
    //sRecvTyp 接受數據類型:0為xml 1為text
    //oResultFunc 返回結果處理函數
</script>
*/

/*應用實例
<script type="text/javascript">
    var ajax1 = new Ajax("1.asp",0,"id="+id,bacal);
    ajax1.post();
    function bacal(obj){
        //返回數據處理函數;
        document.getElementById("test2r").innerHTML=obj.responseText; 
    }
</script>
*/