add restart event

packages/artplayer/src/player/eventInit.js

@@ -40,6 +40,7 @@ export default function eventInit(art, player) {
         art.loading.show = false;
         art.controls.show = true;
         art.mask.show = true;
+        art.isReady = true;
         art.emit('ready');
     });
 

packages/artplayer/src/player/urlMix.js

@@ -19,6 +19,14 @@ export default function urlMix(art, player) {
                     typeCallback.call(art, $video, url, art);
                 });
             } else {
+                if (player.url && player.url !== url) {
+                    art.once('video:canplay', () => {
+                        if (art.isReady) {
+                            art.emit('restart');
+                        }
+                    });
+                }
+
                 $video.src = url;
                 art.option.url = url;
                 art.emit('url', url);