商品详情: 添加'商品详情'标题

 <template>
   <div class="layout">
-    <LayoutHeader class="layout-header" :show-back="true" :title="'\u200E'"></LayoutHeader>
+    <LayoutHeader class="layout-header" :show-back="true" title="商品详情"></LayoutHeader>
     <div class="layout-context fixscroll">
       <LayoutScroll
         ref="pageScroll"