商品详情页banner支持单张图片

+{{#if list}}
 <div class="banner-top">
     <div class="banner-swiper swiper-container">
         <ul class="swiper-wrapper">
@@ -17,4 +18,11 @@
 
     <div class="my-swiper-button-prev prev-grey"></div>
     <div class="my-swiper-button-next next-grey"></div>
-</div>
\ No newline at end of file
+</div>
+        {{^}}
+<div class="banner-top-single">
+<a href={{url}}>
+<img class="img" src="{{img}}">
+</a>
+</div>
+        {{/if}}
\ No newline at end of file