var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.4.0");
var theNodes;
xmlDoc.async = false;
xmlDoc.load("yours.xml");
theNodes = xmlDoc.documentElement.selectNodes("//MYNODE");//确定自己的XPath
var len = theNodes.length;
for(var i = 0; i < len; i++)
{
alert(theNodes[i].Text);
}