优化docs

docs/assets/example/danmuku.js

@@ -1,14 +1,13 @@
-var url = 'https://zhw2590582.github.io/assets-cdn';
 var art = new Artplayer({
     container: '.artplayer-app',
-    url: url + '/video/your-name.mp4',
+    url: '/assets/sample/video.mp4',
     autoSize: true,
     setting: true,
     playbackRate: true,
     fullscreenWeb: true,
     plugins: [
         artplayerPluginDanmuku({
-            danmuku: url + '/danmuku/your-name.xml',
+            danmuku: '/assets/sample/danmuku.xml',
             speed: 5,
             maxlength: 50,
             margin: [10, 100],