讨论问题等

src/components/course/course-comment.vue

 <template>
   <div class="course-comment">
-    <div class="item" v-for="(item, index) in comments" :key="index">
+    <div v-show="comments.length" class="item" v-for="(item, index) in comments" :key="index">
       <img class="img" :src="item.imageUrl || 'https://file.yunqueyi.com/File/doctor_default.png'" alt="头像" @error="onAvatarError" />
       <div class="info-box">
         <div class="info-user">
@@ -23,6 +23,9 @@
         </div>
       </div>
     </div>
+    <div v-show="!comments.length">
+      <img class="img-big" src="~@/images/course/no_comment.png" alt="" />
+    </div>    
     <div class="go-app" @click="download">
       <span>打开App，查看更多讨论内容</span>
     </div>
@@ -91,7 +94,7 @@ export default {
     display: flex;
     font-size: 14px;
     padding: 20px 0;
-    &::after{
+    &::after {
       position: absolute;
       content: "";
       left: 0;
@@ -103,6 +106,11 @@ export default {
       border-bottom: 1px solid #F0F0F0;
     }
   }
+  .img-big {
+    display: block;
+    width: 100px;
+    margin: 40px auto 5px;
+  }
   .img{
     display: block;
     width: 32px;

src/components/course/course-ware.vue

@@ -84,6 +84,11 @@ export default {
       canvas.height = viewport.height;
       canvas.style.display = 'block';
       canvas.style.width = '100%';
+      if (!this.visible) {
+        canvas.style['-webkit-filter'] = 'blur(20px)';
+        canvas.style.filter = 'blur(20px)';
+      }
+      
       let ctx = canvas.getContext("2d");
       let renderTask = pdfPage.render({
         canvasContext: ctx,
@@ -100,8 +105,6 @@ export default {
         cover.style.background = `url(${coverImg}) no-repeat center center`;
         cover.style.backgroundSize = '50px auto';
         // cover.style.backgroundColor = 'rgba(255, 255, 255, .98)';
-        cover.style['-webkit-filter'] = 'blur(20px)';
-        cover.style.filter = 'blur(20px)';
         cover.onclick = () => {
           if (!this.$store.getters.logged) {
             this.$store.dispatch('goLogin');