// JScript File

//创建XMLHttpRequest对象
function GetMsXmlHttp()
{

    var xmlHttp=null;
    //开始初始化XMLHttpRequest对象
    var clsids=["MSXML2.XMLHTTP.6.0","Msxml2.XMLHTTP.5.0","Msxml2.XMLHTTP.4.0","Msxml2.XMLHTTP.3.0",
        "Msxml2.XMLHTTP.2.6","Msxml2.XMLHTTP.1.0","Microsoft.XMLHTTP.1","Microsoft.XMLHTTP"];
       
	if(window.XMLHttpRequest) { //Mozilla 浏览器
		xmlHttp = new XMLHttpRequest();
		if (xmlHttp.overrideMimeType) {//设置MiME类别
			xmlHttp.overrideMimeType("text/xml");
		} 
	}
    else if(window.ActiveXObject)
    {
        for(var i=0;i<clsids.length && xmlHttp==null;i++)
            xmlHttp=CreateXmlHttp(clsids[i]);
            }    
    return xmlHttp;
            
    
}

function CreateXmlHttp(clsid) {
　var xmlHttp = null;
　try {
　　xmlHttp = new ActiveXObject(clsid);
　　//lastclsid = clsid;
　　return xmlHttp;
　}
　catch(e) {}
}


//ajax类 
//使用方法
//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 2Json resultF 返回结果处理函数

function Ajax(loadingobj,loadinginfo,url,recvT,stringS,resultF) {
 this.loadingobj = loadingobj;
 this.loadinginfo = loadinginfo;
 this.url = url;
 this.recvT = recvT;
 this.stringS = stringS;
 this.xmlHttp = this.createXMLHttpRequest();
 if (this.xmlHttp == null) {
      alert("unsuccessful to create xmlHttp object!");
      return;
 } 
 var objxml = this.xmlHttp; 
 objxml.onreadystatechange = function (){Ajax.handleStateChange(loadingobj,loadinginfo,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;
return GetMsXmlHttp();
}

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);
 	
	if (queryString != "") {
        if(this.recvT==2)
            this.xmlHttp.setRequestHeader("Content-Type", "application/json;utf-8");
        else
            this.xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            
	    this.xmlHttp.send(queryString);
	}
	else
	    this.xmlHttp.send(null);
}
 
Ajax.handleStateChange = function (loadingobj,loadinginfo,xmlHttp,recvT,resultF) {

   if(loadingobj!=null)
   {
      switch(xmlHttp.readyState)
　    {
        case 1:
　        loadingobj.innerHTML = loadinginfo;
　        break;
        case 2:
　        loadingobj.innerHTML = loadinginfo;
　        break;
        case 3:
　        loadingobj.innerHTML = loadinginfo;
　        break;
        case 4:
　        loadingobj.innerHTML = "";
　        break;
　    }
　}
　
 if (xmlHttp.readyState == 4) {
  if (xmlHttp.status == 200) {
  
  resultF((recvT==0)?xmlHttp.responseXML:xmlHttp.responseText);
  
  } else {
  alert("您所请求的页面有异常。");
  }
 }
}