ajax请求php一直执行error函数，数据库操作正常，错误500

Question

 $.ajax({
                  type:"post",
                  url:"../php/insert_articles.php",
                  data:"title=" +tle +"&content=" + cnt +"&time=" +time + "&type=" + type,
                  dataType:"jsonp",
                  jsonp: "jsoncallback",
                  error:function(e) {
                    console.log("出错了:"+e.responseText);
                  },
                  success:function(msg){
                    alert("插入成功！");
                   }
            });


            php：

            $result = $db->query($insert);
    if ($result) {
        $list = array("msg" => "insert successfully");
            echo $_POST['jsoncallback']."(".json_encode($list).")";
    }else {

        $list = array("error" =>"an error ocurred");
            echo $_POST['jsoncallback']."(".json_encode($list).")";
    }

错误截图：
![图片说明](https://img-ask.csdn.net/upload/201605/10/1462849117_171571.jpg)

Answer 1

https://img-ask.csdn.net/upload/201605/10/1462849227_30159.jpg