这个地方怎么实现的？

self.on('panel_showed', function (e, showDetail) {        var hasGet = false, unreadsData;        self.resetPosition();        // 显示面板内容        if (unreads !== 0) {          self.getUnreads(self.showListCbWrap(function (err, data, loading) {              unreads = 0;              unreadsData = data.data;          }));          hasGet = true;        }        if (!hasReadedItems) {          $('.notice_content', self.Dom.wrap).empty();          self.getAllReaded(self.showListCbWrap(function (err, data, loading) {            hasReadedItems = true;          }));          hasGet = true;        }        if (hasGet) {          self.Dom.wrap.one('list_showed', function (e, err) {            if (err) {              self.error(err);            } else {              if(showDetail) {                var unreadsItem = $('.notice_list_con .unread', self.Dom.wrap);                if(unreadsItem.length === 1) {                  unreadsItem.trigger('click');                }              }              if (unreadsData && unreadsData.length > 0) {                keepUnread = true;                setTimeout(function() {                  self.setReaded(unreadsData);                }, 1000);              }            }          });        }      }).on('detail_showed', function (e, detail, index) {        // 显示通知详情        $('.detail_con .prvnote', self.Dom.wrap).toggleClass('disabled', !(index > 0));        $('.detail_con .nextnote', self.Dom.wrap).toggleClass('disabled', !detail.next()[0]);        if (!detail.data('loaded') && !$('dd', detail)[0] && !$('.empty:visible', detail)[0] && !$('.loading:visible', detail)[0]) {          self.getDetail(detail);        }      }).on('tip_showing', function () {        keepUnread = false;        if ($('.notice_list_con', self.Dom.wrap).css('display') !== 'none') {          $('.notice_list_con .notice_content .unread', self.Dom.wrap).removeClass('unread');        }        if (unreads > 0) {          self.resetPosition();          $('strong', self.Dom.tip.show()).html(unreads);        }      }).on('receive_unreads', function (e, data) {        // 收到未读消息实时通知 typeof data === number        unreads = (unreads === -1 ? 0 : unreads) + data;        if (self.Dom.wrap.is(':visible')) {          if($('.notice_list_con', self.Dom.wrap).is(':visible')){            self.emit('panel_showed');          }        } else {          self.emit('tip_showing');        }      }).on('receive_setreaded', function (e, data) {        // 收到设置为已读实时通知 typeof data === array or number        if (keepUnread) {        } else { // TODO 如果焦点在当前浏览器窗口，什么都不做          // 非查看窗口收到已读通知时需要重置状态，以便再次打开时能正确显示通知          unreads = -1;          hasReadedItems = false;        }        var num = /*$.isArray(data) ? unreads - data.length : typeof data === 'number' ? data : */0;        if (num <= 0) {          num = 0;          self.Dom.tip.hide();        }        $('strong', self.Dom.tip).html(num);      });      $('.close2', self.Dom.tip).click(function () {        self.Dom.tip.hide();        self.setReaded([], function(){        });      });      $('.tip_text', self.Dom.tip).click(function () {        self.Dom.btn.trigger('click'          // , ['Show one and only unread de