javascript - Changing counter value after different time intervals using PhP, Ajax -


i want create counter changes value after different time interval. have written code dont know doing wrong. used ajax this, in different browser value changing randomly @ same time interval.

counter2.php

`$sql="select counter counter";  $result= mysql_query($sql);  $rows=mysql_fetch_row($result);    $counter=$rows[0];  //$counter--;  echo $counter;    $sql2="update counter set counter= counter-1";  $result2=mysql_query($sql2);

` ajax

countermain.php

<script type="text/javascript">    $(function() {         var updateinterval = 1000; // 10 seconds, in milliseconds          function updatecounter(){              $.ajax({             url: 'counter2.php',             datatype: "json",             type: "get",             success: function(returnvalue){                     $('#alpha').text(returnvalue);                     settimeout(updatecounter, 4000);                 }         });         }        setinterval(updatecounter, updateinterval);     });  </script> </head> <body> <div id="alpha"></div>

let me know , doing wrong?


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