javascript - Cant execute an html file that includes AJAX -


i'm new @ html , want run code includes script demonstrates ajax.this file saved html file. when try run in localhost script doesnt execute. dont understand why. can explain this?

<!doctype html>  <html>  <head>        </head>  <body>    <p id="demo">let ajax change text.</p>    <button type="button" onclick="loaddoc()">change content</button>    <script type="text/javascript">  function loaddoc() {    var xhttp;    if (window.xmlhttprequest) {      // code modern browsers      xhttp = new xmlhttprequest();      } else {      // code ie6, ie5      xhttp = new activexobject("microsoft.xmlhttp");    }    xhttp.onreadystatechange = function() {      if (xhttp.readystate == 4 && xhttp.status == 200) {        document.getelementbyid("demo").innerhtml = xhttp.responsetext;      }    };    xhttp.open("get", "ajax_info.txt", true);    xhttp.send();  }  </script>    </body>  </html>
here output button doesnt have function. enter image description here

thanks in advance.


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