diff --git a/assets/js/_commons/back-to-top.js b/assets/js/_commons/back-to-top.js
index 810d9a6..07532ae 100644
--- a/assets/js/_commons/back-to-top.js
+++ b/assets/js/_commons/back-to-top.js
@@ -3,16 +3,16 @@ Reference: https://bootsnipp.com/snippets/featured/link-to-top-page
 */
 $(window).scroll(function() {
   if ($(this).scrollTop() > 50
-      && $('#sidebar-trigger').css('display') == 'none') {
-    $('#back-to-top').fadeIn();
+      && $("#sidebar-trigger").css("display") === "none") {
+    $("#back-to-top").fadeIn();
   } else {
-    $('#back-to-top').fadeOut();
+    $("#back-to-top").fadeOut();
   }
 });
 
 $(function() {
-  $('#back-to-top').click(function() {
-    $('body,html').animate({scrollTop: 0}, 800);
+  $("#back-to-top").click(function() {
+    $("body,html").animate({scrollTop: 0}, 800);
     return false;
   });
 });
\ No newline at end of file
diff --git a/assets/js/_commons/copy-link.js b/assets/js/_commons/copy-link.js
index 24cc8dc..0f5aab8 100644
--- a/assets/js/_commons/copy-link.js
+++ b/assets/js/_commons/copy-link.js
@@ -1,13 +1,16 @@
 /*
-* Copy current page url to clipboard.
-* v2.1
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2020 Cotes Chung
-* MIT License
-*/
+ * Copy current page url to clipboard.
+ * v2.1
+ * https://github.com/cotes2020/jekyll-theme-chirpy
+ * © 2020 Cotes Chung
+ * MIT License
+ */
 
 function copyLink(url) {
-  if (!url || 0 === url.length)
+  if (!url || 0 === url.length) {
+    return;
+  }
+
   url = window.location.href;
   var $temp = $("<input>");
 
@@ -17,4 +20,5 @@ function copyLink(url) {
   $temp.remove();
 
   alert("Link copied successfully!");
+
 }
\ No newline at end of file
diff --git a/assets/js/_commons/search-display.js b/assets/js/_commons/search-display.js
index a34babd..933d940 100644
--- a/assets/js/_commons/search-display.js
+++ b/assets/js/_commons/search-display.js
@@ -8,18 +8,18 @@
 
 $(function() {
 
-  var btnSbTrigger = $('#sidebar-trigger');
-  var btnSearchTrigger = $('#search-trigger');
-  var btnCancel = $('#search-cancel');
-  var btnClear = $('#search-cleaner');
+  var btnSbTrigger = $("#sidebar-trigger");
+  var btnSearchTrigger = $("#search-trigger");
+  var btnCancel = $("#search-cancel");
+  var btnClear = $("#search-cleaner");
 
-  var main = $('#main');
-  var topbarTitle = $('#topbar-title');
-  var searchWrapper = $('#search-wrapper');
-  var resultWrapper = $('#search-result-wrapper');
-  var results = $('#search-results');
-  var input = $('#search-input');
-  var hints = $('#search-hints');
+  var main = $("#main");
+  var topbarTitle = $("#topbar-title");
+  var searchWrapper = $("#search-wrapper");
+  var resultWrapper = $("#search-result-wrapper");
+  var results = $("#search-results");
+  var input = $("#search-input");
+  var hints = $("#search-hints");
 
 
   /*--- Actions in small screens (Sidebar unloaded) ---*/
@@ -27,75 +27,76 @@ $(function() {
   var scrollBlocker = (function() {
     var offset = 0;
     return {
-      block: function() {
+      block() {
         offset = $(window).scrollTop();
       },
-      release: function() {
-        $('html,body').scrollTop(offset);
+      release() {
+        $("html,body").scrollTop(offset);
       },
-      getOffset: function() {
+      getOffset() {
         return offset;
       }
-    }
-  })();
+    };
+  }());
 
   var mobileSearchBar = (function() {
     return {
-      on: function() {
-        btnSbTrigger.addClass('unloaded');
-        topbarTitle.addClass('unloaded');
-        btnSearchTrigger.addClass('unloaded');
-        searchWrapper.addClass('d-flex');
-        btnCancel.addClass('loaded');
+      on() {
+        btnSbTrigger.addClass("unloaded");
+        topbarTitle.addClass("unloaded");
+        btnSearchTrigger.addClass("unloaded");
+        searchWrapper.addClass("d-flex");
+        btnCancel.addClass("loaded");
       },
-      off: function() {
-        btnCancel.removeClass('loaded');
-        searchWrapper.removeClass('d-flex');
-        btnSbTrigger.removeClass('unloaded');
-        topbarTitle.removeClass('unloaded');
-        btnSearchTrigger.removeClass('unloaded');
+      off() {
+        btnCancel.removeClass("loaded");
+        searchWrapper.removeClass("d-flex");
+        btnSbTrigger.removeClass("unloaded");
+        topbarTitle.removeClass("unloaded");
+        btnSearchTrigger.removeClass("unloaded");
       }
-    }
-  })();
+    };
+  }());
 
   var resultSwitch = (function() {
     var visable = false;
 
     return {
-      on: function() {
+      on() {
         if (!visable) {
-          resultWrapper.removeClass('unloaded');
-          main.addClass('hidden');
+          resultWrapper.removeClass("unloaded");
+          main.addClass("hidden");
 
           visable = true;
           scrollBlocker.block();
         }
       },
-      off: function() {
+      off() {
         if (visable) {
           results.empty();
-          if (hints.hasClass('unloaded')) {
-            hints.removeClass('unloaded');
+          if (hints.hasClass("unloaded")) {
+            hints.removeClass("unloaded");
           }
-          resultWrapper.addClass('unloaded');
-          btnClear.removeClass('visable');
-          main.removeClass('hidden');
+          resultWrapper.addClass("unloaded");
+          btnClear.removeClass("visable");
+          main.removeClass("hidden");
 
-          input.val('');
+          input.val("");
           visable = false;
 
           scrollBlocker.release();
         }
       },
-      isVisable: function() {
+      isVisable() {
         return visable;
       }
-    }
-  })();
+    };
+
+  }());
 
 
   function isMobileView() {
-    return btnCancel.hasClass('loaded');
+    return btnCancel.hasClass("loaded");
   }
 
   btnSearchTrigger.click(function() {
@@ -110,45 +111,45 @@ $(function() {
   });
 
   input.focus(function() {
-    searchWrapper.addClass('input-focus');
+    searchWrapper.addClass("input-focus");
   });
 
   input.focusout(function() {
-    searchWrapper.removeClass('input-focus');
+    searchWrapper.removeClass("input-focus");
   });
 
-  input.on('keyup', function(e) {
-    if (e.keyCode == 8 && input.val() == '') {
+  input.on("keyup", function(e) {
+    if (e.keyCode === 8 && input.val() === "") {
       if (!isMobileView()) {
         resultSwitch.off();
       } else {
-        hints.removeClass('unloaded');
+        hints.removeClass("unloaded");
       }
     } else {
-      if (input.val() != '') {
+      if (input.val() !== "") {
         resultSwitch.on();
 
-        if (!btnClear.hasClass('visible')) {
-          btnClear.addClass('visable');
+        if (!btnClear.hasClass("visible")) {
+          btnClear.addClass("visable");
         }
 
         if (isMobileView()) {
-          hints.addClass('unloaded');
+          hints.addClass("unloaded");
         }
       }
     }
   });
 
-  btnClear.on('click', function() {
-    input.val('');
+  btnClear.on("click", function() {
+    input.val("");
     if (isMobileView()) {
-      hints.removeClass('unloaded');
+      hints.removeClass("unloaded");
       results.empty();
     } else {
       resultSwitch.off();
     }
     input.focus();
-    btnClear.removeClass('visable');
+    btnClear.removeClass("visable");
   });
 
-});
\ No newline at end of file
+});
diff --git a/assets/js/_commons/sidebar.js b/assets/js/_commons/sidebar.js
index bf6551b..44bf3f4 100644
--- a/assets/js/_commons/sidebar.js
+++ b/assets/js/_commons/sidebar.js
@@ -11,24 +11,24 @@ $(function() {
   var sidebarUtil = (function() {
     const ATTR_DISPLAY = "sidebar-display";
     var isExpanded = false;
-    var body = $('body');
+    var body = $("body");
 
     return {
-      toggle: function() {
-        if (isExpanded == false) {
-          body.attr(ATTR_DISPLAY, '');
+      toggle() {
+        if (isExpanded === false) {
+          body.attr(ATTR_DISPLAY, "");
         } else {
           body.removeAttr(ATTR_DISPLAY);
         }
 
         isExpanded = !isExpanded;
       }
-    }
+    };
 
-  })();
+  }());
 
   $("#sidebar-trigger").click(sidebarUtil.toggle);
 
-  $('#mask').click(sidebarUtil.toggle);
+  $("#mask").click(sidebarUtil.toggle);
 
 });
diff --git a/assets/js/_commons/topbar-switch.js b/assets/js/_commons/topbar-switch.js
index 30b1963..0f915bb 100644
--- a/assets/js/_commons/topbar-switch.js
+++ b/assets/js/_commons/topbar-switch.js
@@ -11,7 +11,47 @@ $(function() {
   var didScroll;
   var lastScrollTop = 0;
   var delta = 5;
-  var topbarHeight = $('#topbar-wrapper').outerHeight();
+  var topbarHeight = $("#topbar-wrapper").outerHeight();
+
+  function hasScrolled() {
+    var st = $(this).scrollTop();
+
+    /* Make sure they scroll more than delta */
+    if (Math.abs(lastScrollTop - st) <= delta) {
+      return;
+    }
+
+    if (st > lastScrollTop && st > topbarHeight) {
+      /* Scroll Down */
+      $("#topbar-wrapper").removeClass("topbar-down").addClass("topbar-up");
+
+      if ($("#toc-wrapper").length > 0) {
+        $("#toc-wrapper").removeClass("topbar-down");
+      }
+
+      if ($(".access").length > 0) {
+        $(".access").removeClass("topbar-down");
+      }
+
+      if ($("#search-input").is(":focus")) {
+        $("#search-input").blur(); /* remove focus */
+      }
+
+    } else {
+      /* Scroll Up */
+      if (st + $(window).height() < $(document).height()) {
+        $("#topbar-wrapper").removeClass("topbar-up").addClass("topbar-down");
+        if ($("#toc-wrapper").length > 0) {
+          $("#toc-wrapper").addClass("topbar-down");
+        }
+        if ($(".access").length > 0) {
+          $(".access").addClass("topbar-down");
+        }
+      }
+    }
+
+    lastScrollTop = st;
+  }
 
   $(window).scroll(function(event) {
     if ($("#topbar-title").is(":hidden")) { /* Not in small screens */
@@ -26,42 +66,4 @@ $(function() {
     }
   }, 250);
 
-  function hasScrolled() {
-    var st = $(this).scrollTop();
-
-    /* Make sure they scroll more than delta */
-    if (Math.abs(lastScrollTop - st) <= delta)
-      return;
-
-    if (st > lastScrollTop && st > topbarHeight) {
-      /* Scroll Down */
-      $('#topbar-wrapper').removeClass('topbar-down').addClass('topbar-up');
-
-      if ( $('#toc-wrapper').length > 0) {
-        $('#toc-wrapper').removeClass('topbar-down');
-      }
-
-      if ( $('.access').length > 0) {
-        $('.access').removeClass('topbar-down');
-      }
-
-      if ($('#search-input').is(':focus')) {
-        $('#search-input').blur(); /* remove focus */
-      }
-
-    } else {
-      /* Scroll Up */
-      if (st + $(window).height() < $(document).height()) {
-        $('#topbar-wrapper').removeClass('topbar-up').addClass('topbar-down');
-        if ( $('#toc-wrapper').length > 0) {
-          $('#toc-wrapper').addClass('topbar-down');
-        }
-        if ( $('.access').length > 0) {
-          $('.access').addClass('topbar-down');
-        }
-      }
-    }
-
-    lastScrollTop = st;
-  }
 });
\ No newline at end of file
diff --git a/assets/js/_commons/topbar-title.js b/assets/js/_commons/topbar-title.js
index 136a24f..dc39ae4 100644
--- a/assets/js/_commons/topbar-title.js
+++ b/assets/js/_commons/topbar-title.js
@@ -13,9 +13,9 @@ $(function() {
           $("div.post>h1").text().trim() : $("h1").text().trim();
 
   if ($("#page-category").length || $("#page-tag").length) {
-    /* The title in Category or Tag page will be '<title> <count_of_posts>' */
+    /* The title in Category or Tag page will be "<title> <count_of_posts>" */
     if (/\s/.test(title)) {
-      title = title.replace(/[0-9]/g, '').trim();
+      title = title.replace(/[0-9]/g, "").trim();
     }
   }
 
@@ -29,19 +29,19 @@ $(function() {
     }
 
     if ($(this).scrollTop() >= 95) {
-      if ($("#topbar-title").text() != title) {
+      if ($("#topbar-title").text() !== title) {
         $("#topbar-title").text(title);
       }
     } else {
-      if ($("#topbar-title").text() != DEFAULT) {
+      if ($("#topbar-title").text() !== DEFAULT) {
         $("#topbar-title").text(DEFAULT);
       }
     }
   });
 
   /* Click title remove hover effect. */
-  $('#topbar-title').click(function() {
-    $('body,html').animate({scrollTop: 0}, 800);
+  $("#topbar-title").click(function() {
+    $("body,html").animate({scrollTop: 0}, 800);
   });
 
 });
\ No newline at end of file
diff --git a/assets/js/_utils/category-collapse.js b/assets/js/_utils/category-collapse.js
index d1ff220..71080b6 100644
--- a/assets/js/_utils/category-collapse.js
+++ b/assets/js/_utils/category-collapse.js
@@ -7,26 +7,26 @@
  */
 
 $(function() {
-  var child_prefix = "l_";
-  var parent_prefix = "h_";
+  var childPrefix = "l_";
+  var parentPrefix = "h_";
 
   /* close up top-category */
   $(".collapse").on("hide.bs.collapse", function() { /* Bootstrap collapse events. */
-    var parent_id = parent_prefix + $(this).attr('id').substring(child_prefix.length);
-    if (parent_id) {
-      $("#" + parent_id + " .far.fa-folder-open").attr("class", "far fa-folder fa-fw");
-      $("#" + parent_id + " i.fas").addClass("rotate");
-      $("#" + parent_id).removeClass("hide-border-bottom");
+    var parentId = parentPrefix + $(this).attr("id").substring(childPrefix.length);
+    if (parentId) {
+      $("#" + parentId + " .far.fa-folder-open").attr("class", "far fa-folder fa-fw");
+      $("#" + parentId + " i.fas").addClass("rotate");
+      $("#" + parentId).removeClass("hide-border-bottom");
     }
   });
 
   /* expand the top category */
   $(".collapse").on("show.bs.collapse", function() {
-    var parent_id = parent_prefix + $(this).attr('id').substring(child_prefix.length);
-    if (parent_id) {
-      $("#" + parent_id + " .far.fa-folder").attr("class", "far fa-folder-open fa-fw");
-      $("#" + parent_id + " i.fas").removeClass("rotate");
-      $("#" + parent_id).addClass("hide-border-bottom");
+    var parentId = parentPrefix + $(this).attr("id").substring(childPrefix.length);
+    if (parentId) {
+      $("#" + parentId + " .far.fa-folder").attr("class", "far fa-folder-open fa-fw");
+      $("#" + parentId + " i.fas").removeClass("rotate");
+      $("#" + parentId).addClass("hide-border-bottom");
     }
   });
 
diff --git a/assets/js/_utils/pageviews.js b/assets/js/_utils/pageviews.js
index f787f0b..69edabc 100644
--- a/assets/js/_utils/pageviews.js
+++ b/assets/js/_utils/pageviews.js
@@ -11,84 +11,19 @@
  * MIT License
  */
 
-function countUp(min, max, destId) {
-  if (min < max) {
-    var numAnim = new CountUp(destId, min, max);
-    if (!numAnim.error) {
-      numAnim.start();
-    } else {
-      console.error(numAnim.error);
-    }
-  }
-}
-
-
-function countPV(path, rows) {
-  var count = 0;
-
-  if (rows !== undefined ) {
-    for (var i = 0; i < rows.length; ++i) {
-      var gaPath = rows[i][0];
-      if (gaPath == path) { /* path format see: site.permalink */
-        count += parseInt(rows[i][1]);
-        break;
-      }
-    }
-  }
-
-  return count;
-}
-
-
-function tacklePV(rows, path, elem, hasInit) {
-  var count = countPV(path, rows);
-  count = (count == 0 ? 1 : count);
-
-  if (!hasInit) {
-    elem.text(new Intl.NumberFormat().format(count));
-  } else {
-    var initCount = parseInt(elem.text().replace(/,/g, ''));
-    if (count > initCount) {
-      countUp(initCount, count, elem.attr('id'));
-    }
-  }
-}
-
-
-function displayPageviews(data) {
-  if (data === undefined) {
-    return;
-  }
-
-  var hasInit = getInitStatus();
-  var rows = data.rows; /* could be undefined */
-
-  if ($("#post-list").length > 0) { /* the Home page */
-    $(".post-preview").each(function() {
-      var path = $(this).children("div").children("h1").children("a").attr("href");
-      tacklePV(rows, path, $(this).find('.pageviews'), hasInit);
-    });
-
-  } else if ($(".post").length > 0) { /* the post */
-    var path = window.location.pathname;
-    tacklePV(rows, path, $('#pv'), hasInit);
-  }
-}
-
-
-var getInitStatus = (function() {
+var getInitStatus = (function () {
   var hasInit = false;
-  return function() {
+  return () => {
     let ret = hasInit;
     if (!hasInit) {
       hasInit = true;
     }
     return ret;
-  }
-})();
+  };
+}());
 
 
-var PvCache = (function() {
+var PvCache = (function () {
   const KEY_PV = "pv";
   const KEY_CREATION = "pv_created_date";
   const KEY_PV_SRC = "pv_source";
@@ -107,26 +42,26 @@ var PvCache = (function() {
   }
 
   return {
-    getData: function() {
+    getData() {
       return JSON.parse(localStorage.getItem(KEY_PV) );
     },
-    saveOriginCache: function(pv) {
+    saveOriginCache(pv) {
       set(KEY_PV, pv);
       set(KEY_PV_SRC, Source.ORIGIN );
       set(KEY_CREATION, new Date().toJSON() );
     },
-    saveProxyCache: function(pv) {
+    saveProxyCache(pv) {
       set(KEY_PV, pv);
       set(KEY_PV_SRC, Source.PROXY );
       set(KEY_CREATION, new Date().toJSON() );
     },
-    isFromOrigin: function() {
-      return get(KEY_PV_SRC) == Source.ORIGIN;
+    isFromOrigin() {
+      return get(KEY_PV_SRC) === Source.ORIGIN;
     },
-    isFromProxy: function() {
-      return get(KEY_PV_SRC) == Source.PROXY;
+    isFromProxy() {
+      return get(KEY_PV_SRC) === Source.PROXY;
     },
-    isExpired: function() {
+    isExpired() {
       if (PvCache.isFromOrigin() ) {
         let date = new Date(get(KEY_CREATION));
         date.setDate(date.getDate() + 1); /* update origin records every day */
@@ -139,30 +74,110 @@ var PvCache = (function() {
       }
       return false;
     },
-    getAllPagevies: function() {
+    getAllPagevies() {
       return PvCache.getData().totalsForAllResults["ga:pageviews"];
     },
-    newerThan: function(pv) {
+    newerThan(pv) {
       return PvCache.getAllPagevies() > pv.totalsForAllResults["ga:pageviews"];
     },
-    inspectKeys: function() {
-      if (localStorage.getItem(KEY_PV) == null
-        || localStorage.getItem(KEY_PV_SRC) == null
-        || localStorage.getItem(KEY_CREATION) == null) {
+    inspectKeys() {
+      if (localStorage.getItem(KEY_PV) === null
+        || localStorage.getItem(KEY_PV_SRC) === null
+        || localStorage.getItem(KEY_CREATION) === null) {
         localStorage.clear();
       }
     }
   };
 
-})(); /* PvCache */
+}()); /* PvCache */
+
+function countUp(min, max, destId) {
+  if (min < max) {
+    var numAnim = new CountUp(destId, min, max);
+    if (!numAnim.error) {
+      numAnim.start();
+    } else {
+      console.error(numAnim.error);
+    }
+  }
+}
+
+
+function countPV(path, rows) {
+  var count = 0;
+
+  if (typeof rows !== "undefined" ) {
+    for (var i = 0; i < rows.length; ++i) {
+      var gaPath = rows[i][0];
+      if (gaPath === path) { /* path format see: site.permalink */
+        count += parseInt(rows[i][1], 10);
+        break;
+      }
+    }
+  }
+
+  return count;
+}
+
+
+function tacklePV(rows, path, elem, hasInit) {
+  var count = countPV(path, rows);
+  count = (count === 0 ? 1 : count);
+
+  if (!hasInit) {
+    elem.text(new Intl.NumberFormat().format(count));
+  } else {
+    var initCount = parseInt(elem.text().replace(/,/g, ""), 10);
+    if (count > initCount) {
+      countUp(initCount, count, elem.attr("id"));
+    }
+  }
+}
+
+
+function displayPageviews(data) {
+  if (typeof data === "undefined") {
+    return;
+  }
+
+  var hasInit = getInitStatus();
+  var rows = data.rows; /* could be undefined */
+
+  if ($("#post-list").length > 0) { /* the Home page */
+    $(".post-preview").each(function() {
+      var path = $(this).children("div").children("h1").children("a").attr("href");
+      tacklePV(rows, path, $(this).find(".pageviews"), hasInit);
+    });
+
+  } else if ($(".post").length > 0) { /* the post */
+    var path = window.location.pathname;
+    tacklePV(rows, path, $("#pv"), hasInit);
+  }
+}
+
+
+function fetchProxyPageviews() {
+  $.ajax({
+    type: "GET",
+    url: proxyEndpoint, /* see: /assets/js/_pv-config.js */
+    dataType: "jsonp",
+    jsonpCallback: "displayPageviews",
+    success: (data, textStatus, jqXHR) => {
+      PvCache.saveProxyCache(JSON.stringify(data));
+    },
+    error: (jqXHR, textStatus, errorThrown) => {
+      console.log("Failed to load pageviews from proxy server: " + errorThrown);
+    }
+  });
+}
 
 
 function fetchPageviews(fetchOrigin = true, filterOrigin = false) {
   /* pvCacheEnabled › see: /assets/js/_pv-config.js */
   if (pvCacheEnabled && fetchOrigin) {
-    fetch('/assets/js/data/pageviews.json')
-      .then(response => response.json())
-      .then(data => {
+    fetch("/assets/js/data/pageviews.json")
+      .then((response) => response.json())
+      .then((data) => {
         if (filterOrigin) {
           if (PvCache.newerThan(data)) {
             return;
@@ -180,25 +195,9 @@ function fetchPageviews(fetchOrigin = true, filterOrigin = false) {
 }
 
 
-function fetchProxyPageviews() {
-  $.ajax({
-    type: 'GET',
-    url: proxyEndpoint, /* see: /assets/js/_pv-config.js */
-    dataType: 'jsonp',
-    jsonpCallback: "displayPageviews",
-    success: function(data, textStatus, jqXHR) {
-      PvCache.saveProxyCache(JSON.stringify(data));
-    },
-    error: function(jqXHR, textStatus, errorThrown) {
-      console.log("Failed to load pageviews from proxy server: " + errorThrown);
-    }
-  });
-}
-
-
 $(function() {
 
-  if ($('.pageviews').length > 0) {
+  if ($(".pageviews").length > 0) {
 
     PvCache.inspectKeys();
     let cache = PvCache.getData();
diff --git a/assets/js/_utils/timeago.js b/assets/js/_utils/timeago.js
index 775d501..f98c706 100644
--- a/assets/js/_utils/timeago.js
+++ b/assets/js/_utils/timeago.js
@@ -8,24 +8,28 @@
 
 $(function() {
 
+  var toRefresh = $(".timeago").length;
+
+  var intervalId = void 0;
+
   function timeago(iso, isLastmod) {
     let now = new Date();
     let past = new Date(iso);
 
-    if (past.getFullYear() != now.getFullYear()) {
+    if (past.getFullYear() !== now.getFullYear()) {
       toRefresh -= 1;
       return past.toLocaleString("en-US", {
-         year: 'numeric',
-         month: 'short',
-         day: 'numeric'
+        year: "numeric",
+        month: "short",
+        day: "numeric"
       });
     }
 
-    if (past.getMonth() != now.getMonth()) {
+    if (past.getMonth() !== now.getMonth()) {
       toRefresh -= 1;
       return past.toLocaleString("en-US", {
-         month: 'short',
-         day: 'numeric'
+        month: "short",
+        day: "numeric"
       });
     }
 
@@ -47,37 +51,33 @@ $(function() {
       return minute + " minute" + (minute > 1 ? "s" : "") + " ago";
     }
 
-    return (isLastmod? "just" : "Just") + " now";
+    return (isLastmod ? "just" : "Just") + " now";
   }
 
-
   function updateTimeago() {
     $(".timeago").each(function() {
       if ($(this).children("i").length > 0) {
         var basic = $(this).text();
-        var isLastmod = $(this).hasClass('lastmod');
+        var isLastmod = $(this).hasClass("lastmod");
         var node = $(this).children("i");
-        var date = node.text();   /* ISO Date: 'YYYY-MM-DDTHH:MM:SSZ' */
+        var date = node.text(); /* ISO Date: "YYYY-MM-DDTHH:MM:SSZ" */
         $(this).text(timeago(date, isLastmod));
         $(this).append(node);
       }
     });
 
-    if (toRefresh == 0 && intervalId != undefined) {
-      clearInterval(intervalId);  /* stop interval */
+    if (toRefresh === 0 && typeof intervalId !== "undefined") {
+      clearInterval(intervalId); /* stop interval */
     }
     return toRefresh;
   }
 
-
-  var toRefresh = $(".timeago").length;
-
-  if (toRefresh == 0) {
+  if (toRefresh === 0) {
     return;
   }
 
   if (updateTimeago() > 0) { /* run immediately */
-    var intervalId = setInterval(updateTimeago, 60000); /* run every minute */
+    intervalId = setInterval(updateTimeago, 60000); /* run every minute */
   }
 
-});
\ No newline at end of file
+});
diff --git a/assets/js/_utils/toc-filter.js b/assets/js/_utils/toc-filter.js
index 3078579..1c4f8f9 100644
--- a/assets/js/_utils/toc-filter.js
+++ b/assets/js/_utils/toc-filter.js
@@ -7,8 +7,8 @@
  */
 
 $(function() {
-  if ($("#post-wrapper .post-content h1").length == 0
-      && $("#post-wrapper .post-content h2").length == 0) {
+  if ($("#post-wrapper .post-content h1").length === 0
+      && $("#post-wrapper .post-content h2").length === 0) {
     $("#toc-wrapper").addClass("unloaded");
   }
 });
\ No newline at end of file
diff --git a/assets/js/_utils/tooltip-loader.js b/assets/js/_utils/tooltip-loader.js
index 3926def..de6ed9b 100644
--- a/assets/js/_utils/tooltip-loader.js
+++ b/assets/js/_utils/tooltip-loader.js
@@ -6,5 +6,5 @@
  * MIT License
 */
 $(function () {
-  $('[data-toggle="tooltip"]').tooltip();
+  $("[data-toggle=\"tooltip\"]").tooltip();
 });