text: (function () {
  
      /**
       * @description 监听滚动高度，是否显示返回顶部
       */
      function myCustomFn(el) {
          if (el.mcs.top < -600) {
              if ($('#return-top').css('opacity') === '0') {
                  $('#return-top').velocity('stop').velocity({opacity: 1}, {
                      duration: 500,
                      display: 'block'
                  });
              }
          } else {
              $('#return-top').velocity('stop').velocity({opacity: 0}, {
                  duration: 500,
                  display: 'none'
              });
          }
      }
  
      /**
       * @description 阅读进度
       * @param el
       */
      function readPercent(el) {
          // console.log(el.mcs.content[0].offsetHeight);
          let percent = Math.round(-el.mcs.top / (el.mcs.content[0].offsetHeight - el.offsetHeight) * 100);
          $('.sidebar-toc-progress .progress-num').text(percent);
          $('.sidebar-toc-progress-bar').velocity('stop').velocity({width: percent + '%'}, {
              duration: 100,
              easing: 'easeInOutQuart'
          });
      }
  
      /**
       * @description 滚动到页面顶部
       */
      $('#return-top').on('click', function () {
          $('#content-outer').mCustomScrollbar('scrollTo', 'top', {
              scrollInertia: 1000,
              scrollEasing: 'easeInOut'
          });
      });
  
      /**
       * @description 滚动条修饰 - jquery 插件
       */
      $('#content-outer').mCustomScrollbar({
          theme: 'minimal',
          axis: 'y', // horizontal scrollbar
          callbacks: {
              whileScrolling: function () {
                  myCustomFn(this);
                  readPercent(this);
                  findHeadPosition(this);
              },
              onScroll: function () {
  
              }
          }
      });
      $('#sidebar-toc-content').mCustomScrollbar({
          theme: 'minimal',
          axis: 'y', // horizontal scrollbar
          callbacks: {}
      });
  
      // $('figure.highlight').mCustomScrollbar({
      //     theme: 'minimal',
      //     axis: 'x', // horizontal scrollbar
      //     mouseWheel: {
      //         enable: false
      //     },
      //     callbacks: {}
      // });
  
      /**
       * @description menu link scroll to content
       */
      $('.sidebar-toc-content .toc-link').on('click', function (e) {
          e.preventDefault();
          let _id = $(this).attr('href');
          $('#content-outer').mCustomScrollbar('scrollTo', _id, {
              scrollInertia: 500
          });
      });
  
      /**
       * @description 找到当前页面的位置，更改 active 目录
       * @param el
       */
      function findHeadPosition(el) {
          let currentId = '';
          const menuHeight = $('#menu-outer').height() + 1;
          // console.log(el.mcs);
          let list = $('#post').find('h1,h2,h3,h4,h5,h6');
          list.each(function () {
              if ($(this).offset().top <= menuHeight) {
                  currentId = $(this).attr('id');
              }
          });
          $('.sidebar-toc-content .toc-link').removeClass('active');
          if (currentId === '') {
              // currentId = list[0].id;
              return;
          }
          let $this = $('.sidebar-toc-content .toc-link[href="#' + currentId + '"]');
          $this.addClass('active');
          let parents = $this.parents('.toc-child');
          if (parents.length > 0) {
              let child = null;
              parents.length > 1 ? child = parents.eq(parents.length - 1).find('.toc-child') : child = parents;
              if (child.length > 0 && child.is(':hidden')) {
                  expandToc(child);
              }
              parents.eq(parents.length - 1).closest('.toc-item').siblings('.toc-item').find('.toc-child').hide();
          } else {
              if ($this.closest('.toc-item').find('.toc-child').is(':hidden')) {
                  expandToc($this.closest('.toc-item').find('.toc-child'));
              }
              $this.closest('.toc-item').siblings('.toc-item').find('.toc-child').hide();
          }
      }
  
      /**
       * @description expand toc-item
       * @param $item
       */
      function expandToc($item) {
          // $item.show();
          $item.velocity('stop').velocity('fadeIn', {
              duration: 500,
              easing: 'easeInQuart'
          });
      }
  }());