bug fixes

src/pages/course/tag/tagMessage.vue

 <template>
   <div>
-    <div class="tag-message" :class="classes">
+    <div class="tag-message" :class="classes" @click="showMore = true">
       <div class="tag-message-bd">
         <div class="tag-message-content" ref="content" v-html="html"></div>
       </div>
-      <div class="more" @click="viewMore" v-if="hasMore">
+      <div class="more" @click.stop="toggleMore" v-if="hasMore">
         <template v-if="!showMore">
           <span>更多</span>
           <van-icon name="arrow-down"></van-icon>