feat(cwd-api, widget): 实现评论取消点赞功能

- 添加了评论取消点赞的逻辑处理
- 新增 DELETE /api/comments/like 接口用于取消点赞
- 修改点赞接口支持根据请求方法判断增加或减少点赞数
- 优化点赞数计算逻辑，支持正确的增减操作
- 更新错误提示信息为更通用的操作失败提示

cwd-api/src/api/public/likeComment.ts

@@ -27,6 +27,7 @@ export const likeComment = async (c: Context<{ Bindings: Bindings }>) => {
 	}
 
 	const id = parsed;
+	const method = c.req.method;
 
 	try {
 		const existing = await c.env.CWD_DB.prepare(
@@ -39,26 +40,20 @@ export const likeComment = async (c: Context<{ Bindings: Bindings }>) => {
 			return c.json({ message: 'Comment not found' }, 404);
 		}
 
+		const delta = method === 'DELETE' ? -1 : 1;
+		const currentLikes = typeof existing.likes === 'number' && Number.isFinite(existing.likes) && existing.likes >= 0
+			? existing.likes
+			: 0;
+		const newLikes = Math.max(0, currentLikes + delta);
+
 		await c.env.CWD_DB.prepare(
-			'UPDATE Comment SET likes = COALESCE(likes, 0) + 1 WHERE id = ?'
+			'UPDATE Comment SET likes = ? WHERE id = ?'
 		)
-			.bind(id)
+			.bind(newLikes, id)
 			.run();
 
-		const updated = await c.env.CWD_DB.prepare(
+		return c.json({ id, likes: newLikes });
-			'SELECT COALESCE(likes, 0) as likes FROM Comment WHERE id = ?'
-		)
-			.bind(id)
-			.first<{ likes?: number }>();
-
-		const likes =
-			updated && typeof updated.likes === 'number' && Number.isFinite(updated.likes) && updated.likes >= 0
-				? updated.likes
-				: ((existing.likes || 0) + 1);
-
-		return c.json({ id, likes });
 	} catch (e: any) {
-		return c.json({ message: e?.message || '点赞失败' }, 500);
+		return c.json({ message: e?.message || '操作失败' }, 500);
 	}
 };
-

cwd-api/src/index.ts

@@ -273,6 +273,7 @@ app.get('/api/analytics/pv', getPagePv);
 app.get('/api/like', getLikeStatus);
 app.post('/api/like', likePage);
 app.post('/api/comments/like', likeComment);
+app.delete('/api/comments/like', likeComment);
 app.post('/api/telegram/webhook', telegramWebhook);
 app.get('/api/config/comments', async (c) => {
 	try {

docs/widget/src/components/CommentItem.js

@@ -371,8 +371,12 @@ export class CommentItem extends Component {
 			likedComments.add(commentId);
 			this.saveLikedComments(likedComments);
 			this.props.onLikeComment(commentId, true);
+		} else {
+			// 已点赞，执行取消点赞
+			likedComments.delete(commentId);
+			this.saveLikedComments(likedComments);
+			this.props.onLikeComment(commentId, false);
 		}
-		// 已点赞则不做任何操作
 	}
 
 	/**