// JavaScript Document
/**
 * XMLHttpRequest Object Pool
 *
 * @author    legend <legendsky@hotmail.com>
 * @link      http://www.ugia.cn/?p=85
 * @Copyright www.ugia.cn
 *
 * @update by greengrocery<me5572@163.com>
 */ 

var xmlHTTP = {
    _objPool: [],

    _getInstance: function ()
    {
        //for (var i = 0; i < this._objPool.length; i ++)
//        {
//            if (this._objPool[i].readyState == 0 || this._objPool[i].readyState == 4)
//            {
//                return this._objPool[i];
//            }
//        }

        // IE5中不支持push方法
        this._objPool[this._objPool.length] = this._createObj();

        return this._objPool[this._objPool.length - 1];
    },

    _createObj: function ()
    {
        if (window.XMLHttpRequest)
        {
            var objXMLHttp = new XMLHttpRequest();

        }
        else
        {
            var MSXML = ['MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
            for(var n = 0; n < MSXML.length; n ++)
            {
                try
                {
                    var objXMLHttp = new ActiveXObject(MSXML[n]);
                    break;
                }
                catch(e)
                {
                }
            }
         }          

        // mozilla某些版本没有readyState属性
        if (objXMLHttp.readyState == null)
        {
            objXMLHttp.readyState = 0;

            objXMLHttp.addEventListener("load", function ()
                {
                    objXMLHttp.readyState = 4;

                    if (typeof objXMLHttp.onreadystatechange == "function")
                    {
                        objXMLHttp.onreadystatechange();
                    }
                },  false);
        }

        return objXMLHttp;
    },

    // 发送请求(方法[post,get], 地址, 数据, 回调函数,是否异步)
    //XMLHTTP.sendReq('GET',url,'','loginingstatus','登陆中...');
    sendReq: function (method, url, data, obj,hint)
    {

        var objXMLHttp = this._getInstance();

        with(objXMLHttp)
        {
            try
            {
                // 加随机数防止缓存
                if (url.indexOf("?") > 0)
                {
                    url += "&randnum=" + Math.random();
                }
                else
                {
                    url += "?randnum=" + Math.random();
                }

                open(method, url, true);

                // 设定请求编码方式
                setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=gb2312');
                send(data);
                onreadystatechange = function ()
                {
                    if (objXMLHttp.readyState == 4 && (objXMLHttp.status == 200 || objXMLHttp.status == 304))
                    {
                        //callback(objXMLHttp);
                        //alert(document.getElementById("shijieyichan11").innerHTML);
						document.getElementById(obj).innerHTML = objXMLHttp.responseText;AutoSetNews();
                    }
					else
					{
						document.getElementById(obj).innerHTML = "<tr><td bgcolor=\"#fafff2\"><table cellspacing=\"10\" cellpadding=\"0\" width=\"100%\" border=\"0\"><tbody><tr><td class=\"da\">"+hint+"</td></tr></tbody></table></td></tr>";
					}
                }
            }
            catch(e)
            {
                alert(e);
            }
        }
    }
}

function ShowNext(ns)
{
	var url = "ShowSjyc.aspx?n="+ns;
	xmlHTTP.sendReq('GET',url,'','content','数据载入中...');
}