修改显示来源条件

src/pages/news/preview/index.vue

@@ -2,7 +2,7 @@
   <div class="layout" v-if="article" :class="{mobile: isMobile}" >
     <h2>{{article.title}}</h2>
     <span v-if="article.date">{{new Date(Number(article.date)).format('yyyy-MM-dd')}} 发表</span>
-    <span>来源： {{article.origin}}</span>
+    <span v-if="article.origin">来源： {{article.origin}}</span>
     <div v-html="article.content" class="new-content"></div>
     <br><br><br>
   </div>