even.js

function initMobile() {
  var $mobileNav = document.getElementById("mobile-navbar");
  var $mobileNavIcon = document.querySelector(".mobile-navbar-icon");

  var slideout = new Slideout({
    "panel": document.getElementById("mobile-panel"),
    "menu": document.getElementById("mobile-menu"),
    "padding": 180,
    "tolerance": 70
  });
  slideout.disableTouch();

  $mobileNavIcon.addEventListener("click", function() {
    slideout.toggle();
  });

  slideout.on("beforeopen", function () {
    $mobileNav.classList.add("fixed-open");
    $mobileNavIcon.classList.add("icon-click");
    $mobileNavIcon.classList.remove("icon-out");
  });

  slideout.on("beforeclose", function () {
    $mobileNav.classList.remove("fixed-open");
    $mobileNavIcon.classList.add("icon-out");
    $mobileNavIcon.classList.remove("icon-click");
  });

  document.getElementById("mobile-panel").addEventListener("touchend", function() {
    slideout.isOpen() && $mobileNavIcon.click();
  })
}
function initToc() {
  var $toclink = document.querySelectorAll('.toc-link')
  var $headerlink = document.querySelectorAll('.post-content h1 , .post-content h2')
  var $tocLinkLis = document.querySelectorAll('.post-toc-content li')

  var searchActiveTocIndex = function (array, target) {
    if (!array.length) {
      return -1
    }

    target += 30
    for (let i = 0; i < array.length - 1; i++) {
      if (target > array[i].offsetTop && target <= array[i + 1].offsetTop) return i
    }
    if (target > array[array.length - 1].offsetTop) return array.length - 1
    return -1
  }

  document.addEventListener("scroll", function() {
    var scrollTop = document.body.scrollTop | document.documentElement.scrollTop
    var activeTocIndex = searchActiveTocIndex($headerlink, scrollTop)

    $toclink.forEach(function (el) {
      el.classList.remove('active')
    })
    $tocLinkLis.forEach(function (el) {
      el.classList.remove('has-active')
    })

    if ($toclink.length && activeTocIndex !== -1) {
      $toclink[activeTocIndex].classList.add('active')
      let ancestor = $toclink[activeTocIndex].parentNode
      while (ancestor.tagName !== 'NAV') {
        ancestor.classList.add('has-active')
        ancestor = ancestor.parentNode.parentNode
      }
    }
  })
}

if (document.readyState === "complete" ||
    (document.readyState !== "loading" && !document.documentElement.doScroll)
) {
  initMobile();
  initToc();
} else {
  document.addEventListener("DOMContentLoaded", initMobile);
  document.addEventListener("DOMContentLoaded", initToc);
}