update thumbnails

docs/assets/example/mobile.js

@@ -23,6 +23,11 @@ var art = new Artplayer({
         'x5-video-orientation': 'portraint',
         preload: "metadata"
     },
+    thumbnails: {
+        url: '/assets/sample/thumbnails.png',
+        number: 60,
+        column: 10,
+    },
     subtitle: {
         name: '中日双语',
         url: '/assets/sample/subtitle.srt',