Merge branch 'bug6902' into debug

src/views/ppt_manage/newVersion/components/catalog/pptContent.vue

@@ -5,8 +5,8 @@
           <div class="ppt-item" id="cover" v-if="index===0" :key="item.id">
             <CustomCover :pageInfo="firstPage" :CoverContent="pptCoverContent" v-show="firstPage"/>
           </div>
-          <div class="ppt-item" id="back" v-else-if="isLoadBack&&item.name==='back'&&pptBackImage.length" :key="item.id">
-            <img :src="pptBackImage" class="pptbg" />
+          <div class="ppt-item" id="back" v-else-if="isLoadBack&&item.name==='back'&&firstPage.BackCoverImg.length" :key="item.id">
+            <img :src="firstPage.BackCoverImg" class="pptbg" />
           </div>
           <div class="ppt-item" v-else :key="item.id">
               <!-- 自定义标题 -->
@@ -156,7 +156,7 @@ export default {
         await this.initPageElements(this.pageList[i],'show')
       } 
       this.isLoadBack = true
-      if(this.pptBackImage.length)
+      if(this.firstPage.BackCoverImg.length)
         this.loadArr.push({name:'back'})
 
       //获取已加载图表的信息