cover image url improve

bot/Bilibili.mjs

@@ -60,9 +60,10 @@ class Bilibili extends HeroBot {
 
         //get cover image's base64 data
         //sample: //i1.hdslb.com/bfs/archive/ef6204c8788134064dc6b7e8cb20870f1341e604.jpg@100w_100h_1c.png
+        //替换成：//i1.hdslb.com/bfs/archive/ef6204c8788134064dc6b7e8cb20870f1341e604.jpg@480w_270h_1c.png
         if (typeof(data.cover) != 'undefined' && data.cover) {
             data.cover = common.getAbsoluteUrl(data.cover);
-            data.cover = data.cover.replace(/@[\w\.]+$/ig, '');
+            data.cover = data.cover.replace(/@[\w]+\./ig, '@480w_270h_1c.');
 
             const response = await hero.goto(data.cover);
             const imgBuffer = await response.buffer;