问如何使用jQuery.ui.sortable和jquery.ui.swappable交换elem

EN

var prevPagesOrder = [];

$( "#sortable" ).sortable({
    start: function(event, ui) {
       prevPagesOrder = $(this).sortable('toArray');
    },
    stop: function(event, ui) {
        var currentOrder = $(this).sortable('toArray');
        var move_id = ui.item[0].id;
        var swap_index = currentOrder.indexOf(move_id);
        var swapped_id = prevPagesOrder[swap_index]

        // do stuff for swapping
        // move_id = object moved
        // swapped_id = object swapped with
        }
        return true;
    }
}).disableSelection();