Merge pull request #38 from since2006/master

修复 IE 下左边菜单高度不正确，PageView 无图像内容时页面高度不正确问题

src/components/layouts/PageView.vue

 <template>
   <page-layout :desc="description" :title="getTitle" :link-list="linkList" :search="search" :tabs="tabs">
     <div slot="extra" class="extra-img">
-      <img :src="extraImage"/>
+      <img v-if="typeof extraImage !== 'undefined'" :src="extraImage"/>
     </div>
     <!-- keep-alive  -->
     <route-view ref="content"></route-view>

src/components/page/GlobalLayout.vue

@@ -140,6 +140,7 @@
   }
 
   .layout.ant-layout {
+    height: 100%;
     min-height: 100vh;
     overflow-x: hidden;