Determine if the request header contains a property to determine if it is an AJAX request

Source: Internet
Author: User
Tags http request

  This article describes how to determine whether the request header contains a property to determine whether the AJAX request, such as the following

The code is as follows: <html>  <head>  <script language= "javascript" >    function cl ()   {& nbsp var xmlhttp;    if (window. XMLHttpRequest)   {  xmlhttp=new XMLHttpRequest (); }  else  {  xmlhttp=new-ActiveXObject ("Microsoft.XMLHTTP"); } ("POST", "ajax2.html", True);  Xmlhttp.setrequestheader ("Content-type", "application/x-www-form-urlencoded"); //jquery Yui will send a containing http_x_ by default Requested_with HTTP request Header message, so it is possible to determine whether an AJAX request   Xmlhttp.setrequestheader (' Http_x_requested_ With ', ' Http_x_requested_with ');  xmlhttp.send ();    xmlhttp.onreadystatechange=function ()   {   if (xmlhttp.readystate==4 && xmlhttp.status==200)   {  alert (xmlhttp.responsetext); }  } }    </script>  </head>  <body>  <input type= "button" id= BT "Name=" BT "value=" OK "onclick=" cl (); "/>  </body>  </html>   
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