add normal mode

packages/artplayer/src/player/exclusiveInit.js

@@ -1,5 +1,8 @@
+import { def } from '../utils';
+
 export default function exclusiveInit(art, player) {
     const props = ['min', 'pip', 'fullscreen', 'fullscreenWeb', 'fullscreenRotate'];
+
     props.forEach((name) => {
         const event = `${name}Change`;
         art.on(event, (state) => {
@@ -14,4 +17,10 @@ export default function exclusiveInit(art, player) {
             }
         });
     });
+
+    def(player, 'normal', {
+        get() {
+            return props.every((name) => !player[name]);
+        },
+    });
 }