feat：讨论点赞切换切图

src/views/CourseExchanged.vue

@@ -405,8 +405,11 @@
                         <div class="comment-footer">
                           <span class="comment-time">{{ comment.time }}</span>
                           <div class="discussion-comment-actions">
-                            <button @click="likeComment(comment)" class="discussion-like-btn">
+                            <button @click="likeComment(comment)" class="discussion-like-btn" :class="{ 'liked': comment.isLiked }">
-                              👍 {{ comment.likes || 0 }}
+                              <img :src="comment.isLiked ? '/opinion/赞_thumbs-up备份 2.png' : '/opinion/赞_thumbs-up.png'"
+                                   alt="点赞"
+                                   class="like-icon" />
+                              {{ comment.likes || 0 }}
                             </button>
                             <span class="discussion-reply-text">回复</span>
                           </div>
@@ -2789,7 +2792,12 @@ const loadDiscussionData = async (section: CourseSection) => {
       // 处理讨论数据
       const discussionData = response.data.result
       if (discussionData && Array.isArray(discussionData)) {
-        discussionList.value = discussionData
+        // 为每个评论添加点赞状态字段
+        discussionList.value = discussionData.map(comment => ({
+          ...comment,
+          isLiked: false, // 默认未点赞
+          likes: comment.likes || 0 // 确保有点赞数字段
+        }))
         console.log('✅ 讨论数据加载完成，讨论数量:', discussionList.value.length)
       } else {
         console.warn('⚠️ 讨论数据格式异常:', discussionData)
@@ -2827,6 +2835,7 @@ const submitDiscussionComment = () => {
     content: newComment.value,
     time: new Date().toLocaleString(),
     likes: 0,
+    isLiked: false, // 新评论默认未点赞
     replies: []
   }
 
@@ -2836,8 +2845,26 @@ const submitDiscussionComment = () => {
 }
 
 const likeComment = (comment: any) => {
+  console.log('🔄 点赞操作:', {
+    commentId: comment.id,
+    currentLiked: comment.isLiked,
+    currentLikes: comment.likes
+  })
+
+  // 切换点赞状态
+  if (comment.isLiked) {
+    // 取消点赞
+    comment.isLiked = false
+    comment.likes = Math.max((comment.likes || 0) - 1, 0)
+    message.success('取消点赞！')
+    console.log('✅ 取消点赞成功:', { likes: comment.likes, isLiked: comment.isLiked })
+  } else {
+    // 点赞
+    comment.isLiked = true
     comment.likes = (comment.likes || 0) + 1
     message.success('点赞成功！')
+    console.log('✅ 点赞成功:', { likes: comment.likes, isLiked: comment.isLiked })
+  }
 }
 
 // 处理章节点击 - 已报名状态，可以正常点击
@@ -9332,6 +9359,16 @@ onActivated(() => {
   color: #1890FF;
 }
 
+.discussion-like-btn.liked {
+  color: #1890FF;
+}
+
+.discussion-like-btn .like-icon {
+  width: 16px;
+  height: 16px;
+  object-fit: contain;
+}
+
 .discussion-reply-text {
   font-family: PingFangSC, PingFang SC;
   font-weight: 400;