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  $.ajax({
url: "ckname.php",
        type:"post",         
        dataType:"text/html",
        data: "username=" + "ÖÐÎÄ",
        success:function(msg){
    alert(msg);
}
    }
);
ckname.php´úÂë:
$username = $_POST["username"];
          if($username == "ÖÐÎÄ")
    echo "yes";
            else 
  echo "$username no";

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