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Javascript²Ù×÷Xml

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1.xmlÎļþÈçÏ£º
<?xml version="1.0" encoding="UTF-8"?>
<zip>
<city>
mycity</city>
<state>mystate</state>
</zip>
2.¶Á´ËxmlµÄjavascriptÀý×Ó£º
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script language="javascript"  type="text/javascript">
var url = "NewFile.xml";
String.prototype.Trim = function() { return this.replace(/(^\s*)|(\s*$)/g, ""); }
var xmlDoc;
 var moz = (typeof document.implementation != 'undefined')
   && (typeof document.implementation.createDocument != 'undefined');
 var ie = (typeof window.ActiveXObject != 'undefined');
function importXML(file) {
 if (moz) {
   xmlDoc = document.implementation.createDocument("", "doc", null);
 } else if (ie) {
   xmlDoc = new ActiveXObject("MSXML2.DOMDocument.3.0");
   xmlDoc.async = false;
   while(xmlDoc.readyState != 4) {};
 }
 
 xmlDoc.load(file);
}
importXML(url);
function updateCityState(){
if (moz) {
 var zip = xmlDoc.getElementsByTagName("zip")[0];
 var city;
    var _city = zip.getElementsByTagName("city")[0].firstChild.nodeValue;
      if (_city)   city = _city.Trim();
     
     var state;
     var _state=zip.getElementsByTagName("state")[0].firstChild.nodeValue;
     if(_state) state = _state.Trim();
      document.getElementById('city').value = city;
      document.getElementById('state').value = state;
     
} else if (ie) {
    var cit


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