sort commodity增加返回按钮

components/header/header.js

@@ -14,7 +14,7 @@ Component({
         // 是否是预售、新品、上架
         position:function(value){
            this.setData({ 
-            specialProds:value === "new" || value === "hot" || value === "presale" || value === "sort" 
+            specialProds:value === "new" || value === "hot" || value === "presale"
            })
         }
     },

components/header/header.wxml

@@ -9,7 +9,7 @@
       <image src="/images/index/logo.png" class="logo-image" wx:if="{{position === 'index'}}" bindtap="backHome"></image>
 
       <!-- 返回按钮 -->
-      <image src="/images/mall/back.png" mode="" wx:if="{{specialProds}}" class="back" bindtap="backHome"/>
+      <image src="/images/mall/back.png" mode="" wx:if="{{specialProds || position === 'sort'}}" class="back" bindtap="backHome"/>
 
       <!-- 我的logo -->
       <image src="/images/my/Qlogo.png" mode="" class="my-logo" wx:if="{{position === 'my'}}"/>