添加事件文档

packages/artplayer/src/player/autoSizeMix.js

@@ -25,7 +25,10 @@ export default function resizeMix(art, player) {
                     setStyle($player, 'width', '100%');
                     setStyle($player, 'height', `${percentage}%`);
                 }
-                art.emit('autoSizeChange');
+                art.emit('autoSizeChange', {
+                    width: player.width,
+                    height: player.height,
+                });
             } else {
                 removeClass($container, 'artplayer-auto-size');
                 setStyle($player, 'width', null);