how to get the datatable select all checkbox id in button click code example

Example: check box all in jequery data table

$(document).ready(function () { 
    var oTable = $('#example').dataTable({
        stateSave: true
    });

    var allPages = oTable.fnGetNodes();

    $('body').on('click', '#selectAll', function () {
        if ($(this).hasClass('allChecked')) {
            $('input[type="checkbox"]', allPages).prop('checked', false);
        } else {
            $('input[type="checkbox"]', allPages).prop('checked', true);
        }
        $(this).toggleClass('allChecked');
    })
});