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<XML>
<FLAG>1</FLAG>
<REASON></REASON>
<ADVERT><ADID>64</ADID><ADNAME>Ó¢»ÊÓéÀÖËÄ</ADNAME><ADCONTENT>ÄÚÈÝÒ»</ADCONTENT><ADTIME>50.0</ADTIME></ADVERT>
<ADVERT><ADID>66</ADID><ADNAME>Ó¢»ÊÓéÀÖÈý</ADNAME><ADCONTENT>ÄÚÈݶþ</ADCONTENT><ADTIME>51.0</ADTIME></ADVERT>
</XML>
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//AJAXÏìÓ¦´¦Àíº¯Êý
function doProcess(){
  if(xmlHttp.readyState==4){
  if(xmlHttp.status==200){ 
//´´½¨XML¶ÔÏó
var xmlDoc = xmlHttp.responseXML;//²âÊÔxmlDocÊǶÔÏó
//var testStr = xmlHttp.responseText;//testStr ¼´ÎªÉÏÃæ³öÏÖµÄXMLÎı¾
alert(xmlDoc.childNodes[0]);//µ«ÊÇËûµÄ×Ó½ÚµãΪnull
var flag = xmlDoc.getElementsByTagName("ADVERT");
alert(flag.length);//Êä³öΪ0£¬ÎªÊ²Ã´²»ÊÇ1
if(flag[0].firstChild.nodeValue==1){ //ÕâÀï¾ÍÖ±½Ó±¨´í˵¶ÔÏó²»´æÔÚÁË¡£¡£
var reason = xmlDoc.getElementsByTagName("REASON");
alert(reason[0].firstChild.nodeValue);
}

  }
  }
}
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var xml = xmlDoc.documentElement;
alert(xml.childNodes.length);

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