修改

src/pages/course/courseinfo.vue

@@ -76,7 +76,12 @@
       <div class="full-width course-menu-box q-pt-md">
         <q-list style="width:180px;overflow:hidden">
           <div class="classD1">
-            <img style="width:100%;height:100%;" alt="" :src="courseInfo.CoverImg" />
+            <template v-if="courseInfo.CoverImg">
+              <img style="width:100%;height:100%;" alt="" :src="courseInfo.CoverImg" />
+            </template>
+            <template v-else>
+              <img style="width:100%;height:100%;" alt="" src="../../assets/images/default.png" />
+            </template>
           </div>
           <div class="text_Degree">{{courseInfo.CourseName}}</div>
           <div class="nav-content">