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);
 }