规范化play方法

packages/artplayer/src/player/playMix.js

@@ -10,29 +10,26 @@ export default function playMix(art, player) {
     } = art;
 
     def(player, 'play', {
-        set(value) {
-            if (value) {
-                const promise = $video.play();
-                if (promise.then) {
-                    promise.then().catch(err => {
-                        notice.show = err;
-                        throw err;
-                    });
-                }
+        value() {
+            const promise = $video.play();
 
-                if (mutex) {
-                    instances
-                        .filter(item => item !== art)
-                        .forEach(item => {
-                            item.player.pause = true;
-                        });
-                }
-
-                notice.show = i18n.get('Play');
-                art.emit('play');
-            } else {
-                player.pause = true;
+            if (promise.then) {
+                promise.then().catch((err) => {
+                    notice.show = err;
+                    throw err;
+                });
             }
+
+            if (mutex) {
+                instances
+                    .filter((item) => item !== art)
+                    .forEach((item) => {
+                        item.player.pause();
+                    });
+            }
+
+            notice.show = i18n.get('Play');
+            art.emit('play');
         },
     });
 }