Cannot see the button on each row

Hello everyone,
I want to add edit and delete button on each row but i cant see my buttons. Here is my script,

<

script>
$(document).ready(function () {

        $('#table').DataTable(
            {

                ajax: {
                    "url": "myurl",
                    "type": "GET",
                    "datatype": "json",
                    "dataSrc": "person"
                },

                aoColumns: [

                    { mData: 'name' },
                    { mData: 'surname' },
                    { mData: 'email' }

                ],

                 className: "center",
                 defaultContent: '<a href="" class="editor_edit">Edit</a> / <a href="" class="editor_remove">Delete</a>'



            });

this is my links.,

<script type="text/javascript" src="https://cdn.datatables.net/v/dt/jq-3.3.1/dt-1.10.20/b-1.6.1/datatables.min.js"></script>

<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/dt/jq-3.3.1/dt-1.10.20/b-1.6.1/datatables.min.css" />

I dont know why it is not working. Please help me