添加监听视频卡顿的插件

packages/artplayer/src/player/loadedMix.js

@@ -3,4 +3,8 @@ export default function seekMix(art, player) {
     Object.defineProperty(player, 'loaded', {
         get: () => ($video.buffered.length ? $video.buffered.end($video.buffered.length - 1) / $video.duration : 0),
     });
+
+    Object.defineProperty(player, 'loadedTime', {
+        get: () => ($video.buffered.length ? $video.buffered.end($video.buffered.length - 1) : 0),
+    });
 }