diff --git a/layout/includes/third-party/comments/twikoo.pug b/layout/includes/third-party/comments/twikoo.pug
index 5a18d17..6dac48d 100644
--- a/layout/includes/third-party/comments/twikoo.pug
+++ b/layout/includes/third-party/comments/twikoo.pug
@@ -23,11 +23,11 @@ script.
     const loadTwikoo = (bool = false) => {
       if (typeof twikoo === 'object') {
         init()
-        bool && $countDom && setTimeout(()=>{getCount()},0)
+        bool && $countDom && setTimeout(getCount,0)
       } else {
         getScript('!{theme.CDN.twikoo}').then(()=> {
           init()
-          bool && $countDom && setTimeout(()=>{getCount()},0)
+          bool && $countDom && setTimeout(getCount,0)
         })
       }
     }
diff --git a/layout/includes/third-party/comments/valine.pug b/layout/includes/third-party/comments/valine.pug
index 8bb75ae..5ca95bc 100644
--- a/layout/includes/third-party/comments/valine.pug
+++ b/layout/includes/third-party/comments/valine.pug
@@ -41,7 +41,7 @@ script.
 
   if ('!{theme.comments.use[0]}' === 'Valine' || !!{theme.comments.lazyload}) {
     if (!{theme.comments.lazyload}) btf.loadComment(document.querySelector('#vcomment'),loadValine)
-    else setTimeout(() => loadValine(), 0)
+    else setTimeout(loadValine, 0)
   } else {
     function loadOtherComment () {
       loadValine()
diff --git a/package.json b/package.json
index 417a7c9..3039164 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hexo-theme-butterfly",
-  "version": "3.4.0",
+  "version": "3.4.1",
   "description": "A Simple and Card UI Design theme for Hexo",
   "main": "package.json",
   "scripts": {
diff --git a/source/js/main.js b/source/js/main.js
index 565749c..15a8081 100644
--- a/source/js/main.js
+++ b/source/js/main.js
@@ -471,7 +471,7 @@ document.addEventListener('DOMContentLoaded', function () {
       const currentActive = $tocLink[currentIndex]
       currentActive.classList.add('active')
 
-      setTimeout(function () {
+      setTimeout(() => {
         autoScrollToc(currentActive)
       }, 0)
 
@@ -626,7 +626,7 @@ document.addEventListener('DOMContentLoaded', function () {
  */
   const addRuntime = () => {
     const $runtimeCount = document.getElementById('runtimeshow')
-    if ($runtimeCount !== null) {
+    if ($runtimeCount) {
       const publishDate = $runtimeCount.getAttribute('data-publishDate')
       $runtimeCount.innerText = btf.diffDate(publishDate) + ' ' + GLOBAL_CONFIG.runtime
     }
@@ -637,7 +637,7 @@ document.addEventListener('DOMContentLoaded', function () {
  */
   const addLastPushDate = () => {
     const $lastPushDateItem = document.getElementById('last-push-date')
-    if ($lastPushDateItem !== null) {
+    if ($lastPushDateItem) {
       const lastPushDate = $lastPushDateItem.getAttribute('data-lastPushDate')
       $lastPushDateItem.innerText = btf.diffDate(lastPushDate, true)
     }
@@ -685,7 +685,8 @@ document.addEventListener('DOMContentLoaded', function () {
 
           if (!$tabItem.classList.contains('active')) {
             const $tabContent = $tabItem.parentNode.nextElementSibling
-            btf.siblings($tabItem, '.active')[0].classList.remove('active')
+            const $siblings = btf.siblings($tabItem, '.active')[0]
+            $siblings && $siblings.classList.remove('active')
             $tabItem.classList.add('active')
             const tabId = $this.getAttribute('data-href').replace('#', '')
             const childList = [...$tabContent.children]
@@ -712,7 +713,7 @@ document.addEventListener('DOMContentLoaded', function () {
 
   const toggleCardCategory = function () {
     const $cardCategory = document.querySelectorAll('#aside-cat-list .card-category-list-item.parent i')
-    if ($cardCategory.length > 0) {
+    if ($cardCategory.length) {
       $cardCategory.forEach(function (item) {
         item.addEventListener('click', function (e) {
           e.preventDefault()
diff --git a/source/js/tw_cn.js b/source/js/tw_cn.js
index bbde3c0..78dbd6d 100644
--- a/source/js/tw_cn.js
+++ b/source/js/tw_cn.js
@@ -88,8 +88,9 @@ document.addEventListener('DOMContentLoaded', function () {
     translateButtonObject = document.getElementById('translateLink')
     if (translateButtonObject) {
       if (currentEncoding !== targetEncoding) {
-        setTimeout(function () { translateBody() }, translateDelay)
-        if (targetEncoding === 1) { translateButtonObject.innerHTML = msgToSimplifiedChinese } else translateButtonObject.innerHTML = msgToTraditionalChinese
+        setTimeout(translateBody, translateDelay)
+        if (targetEncoding === 1) translateButtonObject.innerHTML = msgToSimplifiedChinese
+        else translateButtonObject.innerHTML = msgToTraditionalChinese
       }
       translateButtonObject.addEventListener('click', translatePage, false)
     }