bubble: & AJAX - request in externer .js - Was ist es bloss???

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Übersichtshalber mal alle Dokumente:

script.js

function fireRequest(){  
     var ajax = null;  
     if(window.XMLHttpRequest){  
          ajax = new XMLHttpRequest();  
     }  
     else if(window.ActiveXObject){  
          http = new ActiveXObject("Microsoft.XMLHTTP");  
     }  
  
     if(ajax){  
          ajax.open('GET','test.txt',true);  
          ajax.onreadystatechange = function () {  
              if (this.readyState == 4) {  
                  alert(this.responseText);  
              }  
     }  
     ajax.send(null);  
}

test.txt:

  
Das ist der Testinhalt.  

index.htm

  
<!DOCTYPE html>  
<html>  
    <head>  
        <script type="text/javascript" src="script.js"></script>  
    </head>  
    <body>  
        <button onclick="fireRequest();">  
    </body>  
</html>  

MfG
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