Why I can not use ajax.reload()?

I used the newest datatables api ,and my jquery version is V1.11,1, jquery.datatables version is V1.10.2, howerver my code

var table = $('#questionTable').dataTable({
......
});
table.ajax.reload();

doesn't work, chrome hints me "Uncaught TypeError: Cannot read property 'reload' of undefined "
does my usage correct? or I need include other js file? or the jquery , jquery datatables version wrong ?