docs: Update docs with copy & assist function

docs/.vuepress/config.js

@@ -62,6 +62,10 @@ module.exports = {
                 text: 'Third part',
                 link: '/advanced/third-part',
               },
+              {
+                text: 'Assist function',
+                link: '/advanced/assist',
+              },
             ],
           },
         ],
@@ -96,6 +100,10 @@ module.exports = {
                 text: '第三方支持',
                 link: '/zh-CN/advanced/third-part',
               },
+              {
+                text: '辅助功能',
+                link: '/zh-CN/advanced/assist',
+              },
             ],
           },
         ],
@@ -112,7 +120,8 @@ function getEnSidebar(title) {
       children: [
         '/guide/',
         '/advanced/theme-config',
-        '/advanced/third-part'
+        '/advanced/third-part',
+        '/advanced/assist',
       ],
     },
   ];
@@ -126,7 +135,8 @@ function getZhSidebar(title) {
       children: [
         '/zh-CN/guide/',
         '/zh-CN/advanced/theme-config',
-        '/zh-CN/advanced/third-part'
+        '/zh-CN/advanced/third-part',
+        '/zh-CN/advanced/assist',
       ],
     },
   ];

docs/advanced/assist.md

+# Assist function
+
+**There is currently no English document, I will finish it as soon as possible. You can refer to the Chinese document first.**
+
+> If you are interested, you can help me improve the English documentation through [PR](https://github.com/liuyib/hexo-theme-stun/pulls), I will be very grateful.

docs/zh-CN/advanced/assist.md

+# 辅助功能
+
+## 快捷键
+
+- 快速切换文章 <Badge text="stable"/> <Badge text="v1.0.4"/>
+
+当你浏览文章时，如果不想通过鼠标点击按钮来切换文章，那么你可以使用键盘的左右箭头（`←`，`→`）来快速切换文章。
+
+- 快速关闭搜索框 <Badge text="stable"/> <Badge text="v1.0.3"/>
+
+关闭搜索框有三种方式，1. 点击关闭按钮，2. 点击蒙版，3. 按下 `Esc` 键。

source/js/utils.js

@@ -105,7 +105,10 @@ function popAlert(status, text, delay) {
         duration: 300
       }).velocity('reverse', {
         delay: delay * 1000 || 5000,
-        duration: 260
+        duration: 260,
+        complete: function() {
+          $('.stun-alert').css('display', 'none');
+        }
       })
   });
 }