jQuery Ajax Post

HTML

<button type="submit" class="btn btn-success" style="margin:10px" onclick="simpan(this.form) return false">Simpan</button>

Javascript

<script>
      function addsiswa(id){
        $.post("?act=save",{id:id} ).done(function(response){
            console.log(response)
            var node = response.split("<<<")
            if(nodeΏ]==" ok "){location.reload(true)}
            //var wnd = window.open("about:blank", "", "_blank")
            //wnd.document.write(nodeΏ])
            //wnd.document.write(response)
          })  
      }
</script>

<script>
      function addsiswa(fm){
        $.post("?act=save",$(fm).serialize()).done(function(response){
            console.log(response)
            var node = response.split("<<<")
            if(nodeΏ]==" ok "){location.reload(true)}
            //var wnd = window.open("about:blank", "", "_blank")
            //wnd.document.write(nodeΏ])
            //wnd.document.write(response)
          })  
      }
</script>

PHP

<?
if($_GET[act]=="save"){
  $aa=(object) $_POST[a]
  foreach($aa as $key => $value) {$s .= "$key='".mysqli_real_escape_string($db,$value)."', "}
  $s=rtrim($s, ", ")
  $s="insert INTO sia_owner set $s ON DUPLICATE KEY UPDATE $s"
  $db->query($s)
  echo " | $s |"
  echo "<<< ok <<<"
  exit
}
?>