diff --git a/README.es.md b/README.es.md
index 396556f5..3e054ce9 100644
--- a/README.es.md
+++ b/README.es.md
@@ -62,6 +62,8 @@ Vue Element Admin es una solución práctica basada en la nueva plataforma de de
 Necesita instalar [node](https://nodejs.org/) y [git](https://git-scm.com/) localmente. El proyecto es basado en [ES2015+](https://es6.ruanyifeng.com/), [vue](https://cn.vuejs.org/index.html), [vuex](https://vuex.vuejs.org/zh-cn/), [vue-router](https://router.vuejs.org/zh-cn/), [vue-cli](https://github.com/vuejs/vue-cli) , [axios](https://github.com/axios/axios) and [element-ui](https://github.com/ElemeFE/element), toda la solicitud de datos simulada se realiza a través de [Mock.js](https://github.com/nuysoft/Mock).
 Entendiendo y aprendiendo esto pudiera ayudarle con su proyecto.
 
+[![Edit on CodeSandbox](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/PanJiaChen/vue-element-admin/tree/CodeSandbox)
+
  <p align="center">
   <img width="900" src="https://wpimg.wallstcn.com/a5894c1b-f6af-456e-82df-1151da0839bf.png">
 </p>
diff --git a/README.ja.md b/README.ja.md
index 0c49685b..a20a4d71 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -59,6 +59,8 @@
 
 **バグ修正や新規機能追加のissue と pull requestは大歓迎です。**
 
+[![Edit on CodeSandbox](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/PanJiaChen/vue-element-admin/tree/CodeSandbox)
+
  <p align="center">
   <img width="900" src="https://wpimg.wallstcn.com/a5894c1b-f6af-456e-82df-1151da0839bf.png">
 </p>
diff --git a/README.md b/README.md
index a6a10447..458ae970 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,8 @@ English | [简体中文](./README.zh-CN.md) | [日本語](./README.ja.md) | [Spa
 You need to install [node](https://nodejs.org/) and [git](https://git-scm.com/) locally. The project is based on [ES2015+](https://es6.ruanyifeng.com/), [vue](https://cn.vuejs.org/index.html), [vuex](https://vuex.vuejs.org/zh-cn/), [vue-router](https://router.vuejs.org/zh-cn/), [vue-cli](https://github.com/vuejs/vue-cli) , [axios](https://github.com/axios/axios) and [element-ui](https://github.com/ElemeFE/element), all request data is simulated using [Mock.js](https://github.com/nuysoft/Mock).
 Understanding and learning this knowledge in advance will greatly help the use of this project.
 
+[![Edit on CodeSandbox](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/PanJiaChen/vue-element-admin/tree/CodeSandbox)
+
  <p align="center">
   <img width="900" src="https://wpimg.wallstcn.com/a5894c1b-f6af-456e-82df-1151da0839bf.png">
 </p>
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 3df8b8ea..e8424111 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -77,6 +77,8 @@
 
 **如有问题请先看上述使用文档和文章，若不能满足，欢迎 issue 和 pr**
 
+[![Edit on CodeSandbox](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/PanJiaChen/vue-element-admin/tree/CodeSandbox)
+
  <p align="center">
   <img width="900" src="https://wpimg.wallstcn.com/a5894c1b-f6af-456e-82df-1151da0839bf.png">
 </p>
diff --git a/src/components/Tinymce/index.vue b/src/components/Tinymce/index.vue
index c0f486f0..b3538c25 100644
--- a/src/components/Tinymce/index.vue
+++ b/src/components/Tinymce/index.vue
@@ -148,9 +148,9 @@ export default {
             _this.fullscreen = e.state
           })
         },
-        //it will try to keep these URLs intact
-        //https://www.tiny.cloud/docs-3x/reference/configuration/Configuration3x@convert_urls/
-        //https://stackoverflow.com/questions/5196205/disable-tinymce-absolute-to-relative-url-conversions
+        // it will try to keep these URLs intact
+        // https://www.tiny.cloud/docs-3x/reference/configuration/Configuration3x@convert_urls/
+        // https://stackoverflow.com/questions/5196205/disable-tinymce-absolute-to-relative-url-conversions
         convert_urls: false
         // 整合七牛上传
         // images_dataimg_filter(img) {
diff --git a/src/layout/components/Sidebar/Link.vue b/src/layout/components/Sidebar/Link.vue
index eb4dd107..530b3d5b 100644
--- a/src/layout/components/Sidebar/Link.vue
+++ b/src/layout/components/Sidebar/Link.vue
@@ -1,7 +1,5 @@
-
 <template>
-  <!-- eslint-disable vue/require-component-is -->
-  <component v-bind="linkProps(to)">
+  <component :is="type" v-bind="linkProps(to)">
     <slot />
   </component>
 </template>
@@ -16,19 +14,28 @@ export default {
       required: true
     }
   },
+  computed: {
+    isExternal() {
+      return isExternal(this.to)
+    },
+    type() {
+      if (this.isExternal) {
+        return 'a'
+      }
+      return 'router-link'
+    }
+  },
   methods: {
-    linkProps(url) {
-      if (isExternal(url)) {
+    linkProps(to) {
+      if (this.isExternal) {
         return {
-          is: 'a',
-          href: url,
+          href: to,
           target: '_blank',
           rel: 'noopener'
         }
       }
       return {
-        is: 'router-link',
-        to: url
+        to: to
       }
     }
   }
diff --git a/src/layout/components/TagsView/ScrollPane.vue b/src/layout/components/TagsView/ScrollPane.vue
index 0ec76e72..34a7e55f 100644
--- a/src/layout/components/TagsView/ScrollPane.vue
+++ b/src/layout/components/TagsView/ScrollPane.vue
@@ -19,12 +19,21 @@ export default {
       return this.$refs.scrollContainer.$refs.wrap
     }
   },
+  mounted() {
+    this.scrollWrapper.addEventListener('scroll', this.emitScroll, true)
+  },
+  beforeDestroy() {
+    this.scrollWrapper.removeEventListener('scroll', this.emitScroll)
+  },
   methods: {
     handleScroll(e) {
       const eventDelta = e.wheelDelta || -e.deltaY * 40
       const $scrollWrapper = this.scrollWrapper
       $scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4
     },
+    emitScroll() {
+      this.$emit('scroll')
+    },
     moveToTarget(currentTag) {
       const $container = this.$refs.scrollContainer.$el
       const $containerWidth = $container.offsetWidth
diff --git a/src/layout/components/TagsView/index.vue b/src/layout/components/TagsView/index.vue
index 642b4f42..d2a56e70 100644
--- a/src/layout/components/TagsView/index.vue
+++ b/src/layout/components/TagsView/index.vue
@@ -1,6 +1,6 @@
 <template>
   <div id="tags-view-container" class="tags-view-container">
-    <scroll-pane ref="scrollPane" class="tags-view-wrapper">
+    <scroll-pane ref="scrollPane" class="tags-view-wrapper" @scroll="handleScroll">
       <router-link
         v-for="tag in visitedViews"
         ref="tag"
@@ -189,6 +189,9 @@ export default {
     },
     closeMenu() {
       this.visible = false
+    },
+    handleScroll() {
+      this.closeMenu()
     }
   }
 }
diff --git a/src/main.js b/src/main.js
index 1049d762..b5fa135d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -6,6 +6,7 @@ import 'normalize.css/normalize.css' // a modern alternative to CSS resets
 
 import Element from 'element-ui'
 import './styles/element-variables.scss'
+import enLang from 'element-ui/lib/locale/lang/en'// 如果使用中文语言包请默认支持，无需额外引入，请删除该依赖
 
 import '@/styles/index.scss' // global css
 
@@ -33,7 +34,8 @@ if (process.env.NODE_ENV === 'production') {
 }
 
 Vue.use(Element, {
-  size: Cookies.get('size') || 'medium' // set element-ui default size
+  size: Cookies.get('size') || 'medium', // set element-ui default size
+  locale: enLang // 如果使用中文，无需设置，请删除
 })
 
 // register global utility filters
diff --git a/src/permission.js b/src/permission.js
index 750aeab6..ff5eaad2 100644
--- a/src/permission.js
+++ b/src/permission.js
@@ -24,7 +24,7 @@ router.beforeEach(async(to, from, next) => {
     if (to.path === '/login') {
       // if is logged in, redirect to the home page
       next({ path: '/' })
-      NProgress.done()
+      NProgress.done() // hack: https://github.com/PanJiaChen/vue-element-admin/pull/2939
     } else {
       // determine whether the user has obtained his permission roles through getInfo
       const hasRoles = store.getters.roles && store.getters.roles.length > 0
diff --git a/src/styles/element-ui.scss b/src/styles/element-ui.scss
index 955d3cab..49474de3 100644
--- a/src/styles/element-ui.scss
+++ b/src/styles/element-ui.scss
@@ -31,7 +31,7 @@
 .fixed-width {
   .el-button--mini {
     padding: 7px 10px;
-    width: 60px;
+    min-width: 60px;
   }
 }
 
diff --git a/src/styles/element-variables.scss b/src/styles/element-variables.scss
index 30a0e6bc..5bdc4dad 100644
--- a/src/styles/element-variables.scss
+++ b/src/styles/element-variables.scss
@@ -6,7 +6,7 @@
 /* theme color */
 $--color-primary: #1890ff;
 $--color-success: #13ce66;
-$--color-warning: #FFBA00;
+$--color-warning: #ffba00;
 $--color-danger: #ff4949;
 // $--color-info: #1E1E1E;
 
@@ -17,10 +17,10 @@ $--button-font-weight: 400;
 $--border-color-light: #dfe4ed;
 $--border-color-lighter: #e6ebf5;
 
-$--table-border:1px solid#dfe6ec;
+$--table-border: 1px solid #dfe6ec;
 
 /* icon font path, required */
-$--font-path: '~element-ui/lib/theme-chalk/fonts';
+$--font-path: "~element-ui/lib/theme-chalk/fonts";
 
 @import "~element-ui/packages/theme-chalk/src/index";
 
diff --git a/src/utils/index.js b/src/utils/index.js
index eb760d5e..96ee6e7f 100644
--- a/src/utils/index.js
+++ b/src/utils/index.js
@@ -9,7 +9,7 @@
  * @returns {string | null}
  */
 export function parseTime(time, cFormat) {
-  if (arguments.length === 0) {
+  if (arguments.length === 0 || !time) {
     return null
   }
   const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
diff --git a/tests/unit/utils/parseTime.spec.js b/tests/unit/utils/parseTime.spec.js
index bc61d1ac..3e138d00 100644
--- a/tests/unit/utils/parseTime.spec.js
+++ b/tests/unit/utils/parseTime.spec.js
@@ -1,4 +1,5 @@
 import { parseTime } from '@/utils/index.js'
+
 describe('Utils:parseTime', () => {
   const d = new Date('2018-07-13 17:54:01') // "2018-07-13 17:54:01"
   it('timestamp', () => {
@@ -29,4 +30,8 @@ describe('Utils:parseTime', () => {
   it('empty argument', () => {
     expect(parseTime()).toBeNull()
   })
+
+  it('null', () => {
+    expect(parseTime(null)).toBeNull()
+  })
 })