优化docs

docs/assets/example/index.js

@@ -1,9 +1,8 @@
-var url = 'https://zhw2590582.github.io/assets-cdn';
 var art = new Artplayer({
     container: '.artplayer-app',
-    url: url + '/video/one-more-time-one-more-chance-480p.mp4',
+    url: '/assets/sample/video.mp4',
     title: 'One More Time One More Chance',
-    poster: url + '/image/one-more-time-one-more-chance-poster.jpg',
+    poster: '/assets/sample/poster.jpg',
     volume: 0.5,
     isLive: false,
     muted: false,
@@ -59,22 +58,22 @@ var art = new Artplayer({
         {
             default: true,
             name: 'SD 480P',
-            url: url + '/video/one-more-time-one-more-chance-480p.mp4',
+            url: '/assets/sample/video.mp4',
         },
         {
             name: 'HD 720P',
-            url: url + '/video/one-more-time-one-more-chance-720p.mp4',
+            url: '/assets/sample/video.mp4',
         },
     ],
     thumbnails: {
-        url: url + '/image/one-more-time-one-more-chance-thumbnails.png',
+        url: '/assets/sample/thumbnails.png',
         number: 100,
         width: 160,
         height: 90,
         column: 10,
     },
     subtitle: {
-        url: url + '/subtitle/one-more-time-one-more-chance.srt',
+        url: '/assets/sample/subtitle.srt',
         style: {
             color: '#03A9F4',
         },