狂郁闷小弟我的ajax第三个例子就把小弟我给搞死了主要有关问题 getElementsByTagName返回总是0

狂郁闷我的ajax第三个例子就把我给搞死了主要问题 getElementsByTagName返回总是0 - Web 开发 / Ajax
parseXML.html

HTML code

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
  <html xmlns="http://www.w3.org/1999/xhtml"> 
  <head> 
  <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
  <title>paesing XML Response with the w3c DOM </title> 
  <script type="text/javascript"> 
 var xmlHttp; 
 var requestType=""; 
 function createXMLHttpRequest() 
 { 
   if(window.ActiveXObject){ 
        xmlHttp=new ActiveXObject("Microsoft.XMLHttp"); 
 	} 
    else if(window.XMLHttpRequest){ 
        xmlHttp=new XMLHttpRequest(); 
 	} 
 } 
 function startRequest(requestedList) 
 { 
   requestType=requestedList; 
   createXMLHttpRequest(); 
   xmlHttp.onreadystatechange=handleStateChange; 
   xmlHttp.open("GET","parseXML.xml",true); 
   xmlHttp.send(null); 
 } 
 function handleStateChange() 
 { 
   if(xmlHttp.readyState==4){ 
         if(xmlHttp.status==200){ 
 	          if(requestType=="north"){ 
 			     listNothStates(); 
 			  } 
 			  else if(requestType=="all"){ 
 			     listAllStates(); 
 	          } 
 	     } 
    } 
 } 
 function listNorthStates() 
 { 
   var xmlDoc=xmlHttp.responseXML; 
   var northNode=xmlDoc.getElementsByTagName("north")[0]; 
   var out="Northern States"; 
   var northStates=northNode.getElementsByTagName("state"); 
   outputList("Northern States ",northStates); 
 } 
 function listAllStates() 
 {  
   var xmlDoc=xmlHttp.responseXML; 
   var allStates=xmlDoc.getElementsByTagName("state"); 
   outputList("All States in Document",allStates); 
 } 
 function outputList(title,states) 
 {  
   var out=title; 
   var currentState=null; 
   for(var i=0;i <states.length;i++) 
   { 
     currentState=states[i]; 
 	out=out+"\n-"+currentState.childNodes[0].nodeValue; 
   } 
   alert(out); 
 } 
  </script> 
  </head> 

  <body> 
  <h1>process xml document of u.s. states </h1> 
  <form action="#"> 
  <br /> <br /> 
  <input type="button" value="view all listed states" 
   onclick="startRequest('all');" /> 
  <br /> <br /> 
  <input type="button" value="view all listed north northern states" 
   onclick="startRequest('north');" /> 
    </form> 
  </body> 
  </html>

parseXML.xml

XML code

<?xml version="1.0" encoding="UTF-8"?>
<states>
    <north>
        <state>Minnesota</state>
        <state>Iowa</state>
        <state>North Dakota</state>
    </north>
    <south>
        <state>Texas</state>
        <state>Oklahoma</state>
        <state>Louisiana</state>
    </south>
    <east>
        <state>New York</state>
        <state>North Carolina</state>
        <state>Massachusetts</state>
    </east>
    <west>
        <state>California</state>
        <state>Oregon</state>
        <state>Nevada</state>
    </west>
</states>

狂郁闷 小弟我的ajax第三个例子就把小弟我给搞死了 主要有关问题 getElementsByTagName返回总是0

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狂郁闷小弟我的ajax第三个例子就把小弟我给搞死了主要有关问题 getElementsByTagName返回总是0