text: require(['gitbook', 'jquery'], function(gitbook, $) {
      function site(label, icon, link) {
          return {
              label: label,
              icon: 'fa fa-' + icon,
              onClick: function (e) {
                  e.preventDefault();
                  window.open(link);
              }
          };
      }
  
      var url = encodeURIComponent(location.href);
      var title = encodeURIComponent(document.title);
  
      var SITES = {
          douban: site('豆瓣', 'share', 'http://shuo.douban.com/!service/share?href=' + url + '&name=' + title),
          facebook: site('Facebook', 'facebook', 'http://www.facebook.com/sharer/sharer.php?s=100&p[url]=' + url),
          google: site('Google+', 'google-plus', 'https://plus.google.com/share?url=' + url),
          hatenaBookmark: site('はてなブックマーク', 'bold', 'http://b.hatena.ne.jp/entry/' + url),
          instapaper: site('instapaper', 'instapaper', 'http://www.instapaper.com/text?u=' + url),
          line: site('LINE', 'comment', 'http://line.me/R/msg/text/?' + title + ' ' + url),
          linkedin: site('Linkedin', 'linkedin', 'https://www.linkedin.com/shareArticle?mini=true&url=' + url),
          messenger: site('Facebook Messenger', 'commenting', 'fb-messenger://share?link=' + url),
          pocket: site('Pocket', 'get-pocket', 'https://getpocket.com/save?url=' + url + '&title=' + title),
          qq: site('QQ', 'qq', 'http://connect.qq.com/widget/shareqq/index.html?url=' + url + '&title=' + title),
          qzone: site('QQ空间', 'star', 'http://sns.qzone.qq.com/cgi-bin/qzshare/cgi_qzshare_onekey?url=' + url + '&title=' + title),
          stumbleupon: site('StumbleUpon', 'stumbleupon', 'http://www.stumbleupon.com/submit?url=' + url + '&title=' + title),
          twitter: site('Twitter', 'twitter', 'https://twitter.com/intent/tweet?url=' + title + '&text=' + title),
          viber: site('Viber', 'volume-control-phone', 'viber://forward?text='+ url + ' ' + title),
          vk: site('VK', 'vk', 'http://vkontakte.ru/share.php?url=' + url),
          weibo: site('新浪微博', 'weibo', 'http://service.weibo.com/share/share.php?content=utf-8&url=' + url + '&title=' + title),
          whatsapp: site('WhatsApp', 'whatsapp', 'whatsapp://send?text='+ url + ' ' + title),
      };
  
      gitbook.events.bind('start', function(e, config) {
          var opts = config.sharing;
  
          // Create dropdown menu
          var menu = $.map(opts.all, function(id) {
              var site = SITES[id];
  
              return {
                  text: site.label,
                  onClick: site.onClick
              };
          });
  
          // Create main button with dropdown
          if (menu.length > 0) {
              gitbook.toolbar.createButton({
                  icon: 'fa fa-share-alt',
                  label: 'Share',
                  position: 'right',
                  dropdown: [menu]
              });
          }
  
          // Direct actions to share
          $.each(SITES, function(sideId, site) {
              if (!opts[sideId]) return;
  
              gitbook.toolbar.createButton({
                  icon: site.icon,
                  label: site.text,
                  position: 'right',
                  onClick: site.onClick
              });
          });
      });
  });
  