var xml_http_building_link = '请稍候，连接建立中…';
var xml_http_sending = '请稍候，数据交换中…';
var xml_http_loading = '请稍候，数据交换中…';
var xml_http_load_failed = '通信故障，请刷新页面！';
var xml_http_data_in_processed = '通信成功，数据处理中…';
function Ajax(statusId, recvType) {
    var aj = new Object();
    if(document.getElementById(statusId)) {
        aj.statusId = document.getElementById(statusId);
    } else {
        var divElement = document.createElement("DIV");
        divElement.className = "xweb-ajaxmsg";
        divElement.style.position = "fixed";
        divElement.style.right = "0";
        divElement.style.top = "0";
        divElement.style.background = "red";
        divElement.style.color = "#FFF";
        divElement.style.lineHeight = "2em";
        divElement.style.padding = "0 20px";
        divElement.id = statusId;
        document.body.appendChild(divElement);
        aj.statusId = divElement;
    }
    aj.targetUrl = '';
    aj.sendString = '';
    aj.recvType = recvType ? recvType : 'HTML';
    aj.resultHandle = null;
    aj.createXMLHttpRequest = function() {
        var request = false;
        if(window.XMLHttpRequest) {
            request = new XMLHttpRequest();
            if(request.overrideMimeType) {
                request.overrideMimeType('text/xml');
            }
        } else if(window.ActiveXObject) {
            var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
            for(var i=0; i<versions.length; i++) {
                try {
                    request = new ActiveXObject(versions[i]);
                    if(request) {
                        return request;
                    }
                } catch(e) {
                }
            }
        }
        return request;
    }
    aj.XMLHttpRequest = aj.createXMLHttpRequest();
    aj.processHandle = function() {
        aj.statusId.style.display = '';
        if(aj.XMLHttpRequest.readyState == 1) {
            aj.statusId.innerHTML = xml_http_building_link;
        } else if(aj.XMLHttpRequest.readyState == 2) {
            aj.statusId.innerHTML = xml_http_sending;
        } else if(aj.XMLHttpRequest.readyState == 3) {
            aj.statusId.innerHTML = xml_http_loading;
        } else if(aj.XMLHttpRequest.readyState == 4) {
            if(aj.XMLHttpRequest.status == 200) {
                aj.statusId.style.display = 'none';
                if(aj.recvType == 'HTML') {
                    aj.resultHandle(aj.XMLHttpRequest.responseText);
                } else if(aj.recvType == 'XML') {
                    aj.resultHandle(aj.XMLHttpRequest.responseXML);
                }
            } else {
                aj.statusId.innerHTML = xml_http_load_failed;
            }
        }
    }
    aj.get = function(targetUrl, resultHandle) {
        aj.targetUrl = targetUrl;
        aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
        aj.resultHandle = resultHandle;
        if(window.XMLHttpRequest) {
            aj.XMLHttpRequest.open('GET', aj.targetUrl);
            aj.XMLHttpRequest.send(null);
        } else {
            aj.XMLHttpRequest.open("GET", targetUrl, true);
            aj.XMLHttpRequest.send();
        }
    }
    aj.post = function(targetUrl, sendString, resultHandle) {
        aj.targetUrl = targetUrl;
        aj.sendString = sendString;
        aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
        aj.resultHandle = resultHandle;
        aj.XMLHttpRequest.open('POST', targetUrl);
        aj.XMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        aj.XMLHttpRequest.send(aj.sendString);
    }
    return aj;
}