ajax取值,该如何处理

 
 $.ajax({
   type: "post",   
   url: "ddd.php",   
   data: {"inserted":[{"productionName":"空压机","product":"科兴","productionType":"KX-11D","fenjieselect":"分解","proctionNO":"02"},{"productionName":"空压机","product":"科兴","productionType":"KX-12D","fenjieselect":"分解","proctionNO":"03"}],"updated":[],"deleted":[]},   
   datatype: "text",
   success:function(data){
    alert (data);

 } 

})  

if($_POST) {
  print_r($_POST);
  exit;
}
?>