这是树形结构的一个插件，看不太懂，跪求大神指点

$(function () {
            var options = {
                placeholderCss: { 'background-color': '#ff8' },
                hintCss: { 'background-color': '#bbf' },
                isAllowed: function (cEl, hint, target) {
                    if (hint.parents('li').first().data('module') === 'c' && cEl.data('module') !== 'c') {
                        hint.css('background-color', '#ff9999');
                        return false;
                    }
                    else {
                        hint.css('background-color', '#99ff99');
                        return true;
                    }
                },
                opener: {
                    active: true,
                    close: 'images/Remove2.png',
                    open: 'images/Add2.png',
                    openerCss: {
                        'display': 'inline-block',
                        'width': '18px',
                        'height': '18px',
                        'float': 'left',
                        'margin-left': '-35px',
                        'margin-right': '5px',
                        'background-position': 'center center',
                        'background-repeat': 'no-repeat'
                    },
                    openerClass: ''
                }
            },
        sWrapper = $('#settingsWrapper');
            $('#sTree2, #sTree').sortableLists(options);
            $('#toArrBtn').on('click', function () { console.log($('#sTree2').sortableListsToArray()); });
            $('#toHierBtn').on('click', function () { console.log($('#sTree2').sortableListsToHierarchy()); });
            $('#toStrBtn').on('click', function () { console.log($('#sTree2').sortableListsToString()); });
            $('.descPicture').on('click', function (e) { $(this).toggleClass('descPictureClose'); });
        });