fix:rm key

Author: PanJiaChen

src/views/layout/components/AppMain.vue

@@ -2,7 +2,7 @@
   <section class="app-main">
     <transition name="fade" mode="out-in">
       <!-- <router-view :key="key"></router-view> -->
-      <router-view :key="key"></router-view>
+      <router-view></router-view>
     </transition>
   </section>
 </template>