javascript原型方法

function createXMLHttp() {
    if(window.XMLHttpRequest){
        return new XMLHttpRequest();
    } else if(window.ActiveXObject){
    return new ActiveXObject("Microsoft.XMLHTTP");

    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) { }
    }

    } 
    throw new Error("XMLHttp object could be created.");
}

function _sendRequest(url,func,isxml,postdata)
{
    var xhr=createXMLHttp();
    if(!postdata)postdata=null;
    xhr.open(postdata?"POST":"GET",url,true);
    if (postdata)
    {
        xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    }
    if(func){
        xhr.onreadystatechange=function(){
            if(xhr.readyState==4){
                func(isxml&&xhr.responseXML?xhr.responseXML:xhr.responseText)
            }
        }
    }
    if (postdata === true)
    {
        postdata = '';
    }
    xhr.send(postdata)
}

function showadminlogpage(dataSource) {

    _sendRequest(dataSource, function (responseText) {
        var varlist;

        try {
            varlist = eval("(" + responseText + ")");
        }
        catch (e) {
            varlist = new Array();
        }

        var html = '<table border="1" width="100%">';

        var adminloglist = varlist.adminloglist;
        var pagenumbers = varlist.pagenumbers;

        var pagenumbers_buttom = 'adminlog_pagenumbers';
        var page_owner = 'adminlogpage_owner';

        for (var i = 0; i < adminloglist.length; i++) {
            html += '    <tr>'
            html += '        <td>Visitid:' + adminloglist[i].Visitid + '</td>';
            html += '        <td>Adminname:' + adminloglist[i].Adminname + '</td>';
            html += '        <td>Ip:' + adminloglist[i].Ip + '</td>';
            html += '        <td>Others:' + adminloglist[i].Others + '</td>';
            html += '        <td>Actiontype:' + adminloglist[i].Actiontype + '</td>';
            html += '        <td>Addtime:' + adminloglist[i].Addtime + '</td>';
            html += '    </tr>'
        }
        html += '</table>'
        document.getElementById(pagenumbers_buttom).innerHTML = pagenumbers;
        document.getElementById(page_owner).innerHTML = html;
    }, false);
}