doc: add new article

src/components/Share/DropdownMenu.vue

@@ -38,7 +38,7 @@ export default {
 </script>
 
 <style lang="scss" >
-$n: 8; //和items.length 相同
+$n: 9; //和items.length 相同
 $t: .1s;
 .share-dropdown-menu {
   width: 250px;

src/views/components-demo/mixin.vue

@@ -149,6 +149,7 @@ export default {
         { title: '登录权限篇', href: 'https://juejin.im/post/591aa14f570c35006961acac' },
         { title: '实战篇', href: 'https://juejin.im/post/593121aa0ce4630057f70d35' },
         { title: 'vue-admin-template 篇', href: 'https://juejin.im/post/595b4d776fb9a06bbe7dba56' },
+        { title: 'v4.0 篇', href: 'https://juejin.im/post/5c92ff94f265da6128275a85' },
         { title: '优雅的使用 icon', href: 'https://juejin.im/post/59bb864b5188257e7a427c09' }
       ]
     }

src/views/documentation/index.vue

@@ -32,6 +32,7 @@ export default {
         { title: '登录权限篇', href: 'https://juejin.im/post/591aa14f570c35006961acac' },
         { title: '实战篇', href: 'https://juejin.im/post/593121aa0ce4630057f70d35' },
         { title: 'vue-admin-template 篇', href: 'https://juejin.im/post/595b4d776fb9a06bbe7dba56' },
+        { title: 'v4.0 篇', href: 'https://juejin.im/post/5c92ff94f265da6128275a85' },
         { title: '自行封装 component', href: 'https://segmentfault.com/a/1190000009090836' },
         { title: '优雅的使用 icon', href: 'https://juejin.im/post/59bb864b5188257e7a427c09' },
         { title: 'webpack4（上）', href: 'https://juejin.im/post/59bb864b5188257e7a427c09' },