function $(e){
	if (typeof e== 'string')
      return document.getElementById(e);
}

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("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.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) {
			var str=null;
			if(recvT==0){
				 str=xmlHttp.responseXML;
			}else if(recvT==1){
				str=xmlHttp.responseText;
			}else{
				alert("传输数据参数不匹配");
			}
			resultF(str);
		} else {
		//alert("您所请求的页面有异常。");
		}
	}
}
/*
var classajax = new Ajax(url,recvT,stringS,resultF);
classajax.post();//post方式发送数据
classajax.get();//get方式发送数据
url发送地址 recvT 接受数据类型 0为xml 1为text resultF 返回结果处理函数

例
var ajax1 = new Ajax("1.asp",0,"id="+id,bacal);
ajax1.post();
function bacal(rexm){
返回数据处理函数;
}
*/