如何使用JQuery pdfHtml5使整个DataTable在pdf中居中？

 var table = $('#example').DataTable();

 new $.fn.dataTable.Buttons(table, {

   buttons: [{

     extend: 'pdfHtml5',

     customize: function(doc) {

       // 设置PDF导出的样式和布局

       doc.styles.tableBodyEven.alignment = 'center';

       doc.styles.tableBodyOdd.alignment = 'center';

       doc.styles.tableFooter.alignment = 'center';

       doc.styles.tableHeader.alignment = 'center';

     }

   }]

 });

 table.buttons().container().appendTo('#example_wrapper .col-md-6:eq(0)');

 <div class="col-md-6">

   <button class="dt-button buttons-pdf buttons-html5">导出PDF</button>

 </div>