AJAX实践之与服务器通信(1)(2)

// ------------------------------------------------ 
// Function: CreateXMLDOM 
//
// Purpose: Creates a new XML DOM. 
//
// Parameters: None 
//
// Returns: XMLDOM object OR null 
// -------------------------------------------------
function CreateXmlDOM()
{
　var oXML = new ActiveXObject(GetXmlParserProgID());
　try 
　{
oXML.setProperty( " AllowXsltScript " , true );
　} 
　catch (err) {} 
　oXML.async = false ;
　oXML.validateOnParse = false ;
　oXML.resolveExternals = false ;
　oXML.setProperty( " SelectionLanguage " , " XPath " );
　try {oXML.setProperty( " NewParser " , true );} catch (e) {} 
　return oXML;
} 
// -------------------------------------------------
// Function: GetXmlParserProgID 
//
// Purpose: 
// Gets the ProgID of the highest available version of the 
// Microsoft XML parser. 
//
// Parameters: None 
//
// Returns: String (i.e. "Msxml2.DOMDocument.4.0") 
//
// ------------------------------------------------- 
function GetXmlParserProgID()
{
　var MAX_MAJOR_PARSER_VERSION = 10 ;
　var MIN_MAJOR_PARSER_VERSION = 0 ;
　var MAX_MINOR_PARSER_VERSION = 9 ;
　var MIN_MINOR_PARSER_VERSION = 0 ;
　var sProgID = g_sXmlParserProgID;
　var bFound = false ;
　if ( ! sProgID)
　{
// Iterate through possible versions 
for ( var nMajor = MAX_MAJOR_PARSER_VERSION; 
nMajor >= MIN_MAJOR_PARSER_VERSION; nMajor -- )
{
　for ( var nMinor = MAX_MINOR_PARSER_VERSION; 
nMinor >= MIN_MINOR_PARSER_VERSION; nMinor -- )
　{
// Set up the classname for the version that 
we're trying to instantiate 
sProgID = " Msxml2.DOMDocument. " + nMajor + " . " + nMinor;
try 
{ 
　if ( new ActiveXObject(sProgID)) 
　{
bFound = true ;
break ;
　} 
} 
catch (e)
{} 
　} 
　if (bFound)
　{
// store in a global variable to 
speedup subsequent calls 
g_sXmlParserProgID = sProgID;
break ;
　} 
} 
　} 
　return sProgID;
}然后直接用其load方法（本地）。
var xmlDoc = new ActiveXObject( " MSXML2.DOMDocument.3.0 " );
xmlDoc.load(local_XML_FileName);