fix(aside): show tooltip when mouse hover collapse aside

Author: lbwa

src/layout/Material/Header.vue src/layout/Material/Header/index.vuesrc/layout/Material/Header.vue renamed to src/layout/Material/Header/index.vue

@@ -14,7 +14,12 @@
 
     <div class="user">
       <!-- 此处用户头像地址应是与用户信息耦合，而不与静态文件耦合 -->
-      <img src="./logo.png" height="50%" alt="avatar" class="user__avatar">
+      <img
+        src="~../img/logo.png"
+        height="50%"
+        alt="avatar"
+        class="user__avatar"
+      >
       <span class="user__name">{{username}}</span>
     </div>
   </el-header>

src/layout/Material/logo.png src/layout/Material/img/logo.pngsrc/layout/Material/logo.png renamed to src/layout/Material/img/logo.png

@@ -15,7 +15,8 @@ import {
   Menu,
   Submenu,
   MenuItem,
-  Scrollbar
+  Scrollbar,
+  Tooltip // menu 折叠时，弹出的小提示
 } from 'element-ui'
 
 // Prototype functions
@@ -36,5 +37,6 @@ vueUsing([
   Menu,
   Submenu,
   MenuItem,
-  Scrollbar
+  Scrollbar,
+  Tooltip
 ])