修改：调整部分页面样式问题；

src/layouts/HeaderlAvatar.vue

@@ -1,7 +1,7 @@
 <template>
   <a-dropdown>
     <div class="header-avatar" style="cursor: pointer">
-      <a-avatar class="avatar" :size="30" shape="circle" :src="user.avatar"/>
+      <a-avatar class="avatar" size="small" shape="circle" :src="user.avatar"/>
       <span class="name">{{user.name}}</span>
     </div>
     <a-menu :class="['avatar-menu']" slot="overlay">

src/layouts/PageLayout.vue

@@ -11,7 +11,7 @@
           </template>
         </div>
       </div>
-      <slot v-if="this.$refs.extra" slot="extra" name="extra"></slot>
+      <slot v-if="this.$slots.extra" slot="extra" name="extra"></slot>
     </page-header>
     <div ref="page" :class="['page-content', layout]" >
       <slot></slot>