fix: 修復開啟anchor後,瀏覽器上一頁/下一頁 跳轉會404的bug (文章頁的url hash 在pjax下變成 undefined)

fix: 修復開啟anchor後，文章頁跳轉回主頁，主頁網址的hash添加上文章頁最後一個標題的 bug
improvement: 優化 button tags 標簽外掛

source/css/_tags/button.styl

@@ -11,6 +11,9 @@
     color: $btn-color
     line-height: 2
 
+    i + span
+      margin-left: .3rem
+
     &:not(.block) + .btn-beautify:not(.block)
       margin: 0 .2rem 1rem
 

source/js/main.js

@@ -388,11 +388,14 @@ document.addEventListener('DOMContentLoaded', function () {
     const $article = document.getElementById('article-container')
 
     // main of scroll
-    window.addEventListener('scroll', btf.throttle(function (e) {
-      const currentTop = window.scrollY || document.documentElement.scrollTop
-      scrollPercent(currentTop)
-      findHeadPosition(currentTop)
-    }, 100))
+    window.tocScrollFn = function () {
+      return btf.throttle(function () {
+        const currentTop = window.scrollY || document.documentElement.scrollTop
+        scrollPercent(currentTop)
+        findHeadPosition(currentTop)
+      }, 100)()
+    }
+    window.addEventListener('scroll', tocScrollFn)
 
     const scrollPercent = function (currentTop) {
       const docHeight = $article.clientHeight