var xmlHttp = false;
try
{
    xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
    try
    {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (e)
    {
        xmlHttp = false;
    }
}
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
    xmlHttp = new XMLHttpRequest();
}

function asynSubmit(url,data,submit_method,processResponse) {

    xmlHttp.open(submit_method.toUpperCase(), submit_method.toUpperCase() == "GET"? encodeURI(url+"?"+data) : url, true);
    xmlHttp.onreadystatechange = processResponse;   
    xmlHttp.setRequestHeader("Cache-Control","no-cache");
    if (submit_method.toUpperCase() == "POST") {
        xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xmlHttp.send(encodeURI(data));
    } else xmlHttp.send(null);
}

function asynSubmit(url,data,submit_method,callbackMethod,params) {

    xmlHttp.open(submit_method.toUpperCase(), submit_method.toUpperCase() == "GET"? encodeURI(url+"?"+data) : url, true);
    xmlHttp.onreadystatechange = function() {processResponse(callbackMethod,params);};
    xmlHttp.setRequestHeader("Cache-Control","no-cache");
    if (submit_method.toUpperCase() == "POST") {
        xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xmlHttp.send(encodeURI(data));
    } else xmlHttp.send(null);
}

function processResponse(callbackMethod,params) {
    if (xmlHttp.readyState == 4)
        eval(callbackMethod)(params);
}

function generateAJAXResponseHTML(domNodes){
    var nodeHtml = '';
    for(var i=0; i<domNodes.length; i++){
        nodeHtml += domNodes[i].nodeValue;
    }
    return nodeHtml;
}

function processError(status, response) {

    if (status == 404)
        alert("对不起，您所访问的页面不存在或已经被删除！");
    else if (status == 403) {
        alert("登录超时！请返回重试……");
        location.href='/user/login';
    }
    else if (status == 400 || status == 503)
        alert(response);
    else if (status == 500)
        alert("内部错误调试中，请稍后再试！");

}


function initVarMap(varMap) {
    var data = "";
    if (varMap && null != varMap) {
        for (var name in varMap) {
            if (varMap[name] != null) {
                if (data == "")
                    data = name + '=' + encodeURIComponent(varMap[name]);
                else
                    data += '&' + name + '=' + encodeURIComponent(varMap[name]);
            }
        }
    }
    return data;
}