以下代码在IE下是可以正常，但是用NETBOX封装就不行了，运行到红色的地方就出错了，说缺少对像，请问怎么样修改。
JScript code:
//////////////////// AJAX类////////////////
function getxmlDoc(){
var xmlDoc=null;
if(window.ActiveXObject){
var i,activeXarr;
var activeXarr = ["Microsoft.XmlDom","MSXML.DOMDocument","MSXML2.DOMDocument","MSXML3.DOMDocument","MSXML4.DOMDocument"];
for(i=0; i<activeXarr.length; i++){
try{
xmlDoc = new ActiveXObject(activeXarr[i]);
xmlDoc.async=false;
return xmlDoc;
}catch(e){}
}
}else if (document.implementation && document.implementation.createDocument){
xmlDoc=document.implementation.createDocument("","",null);
xmlDoc.async=false;
return xmlDoc;
}else{
alert("Your browser cannot handle this script");
}
}
/////////////////////////////////////////
var xmlDoc =new getxmlDoc();
var url =strUrl+".asp?"+str; // URL为default.asp
xmlDoc.load(url);
var px= xmlDoc.getElementsByTagName("price"
