fix miniProgressBar

packages/artplayer/src/plugins/miniProgressBar.js

@@ -1,17 +1,17 @@
 export default function miniProgressBar(art) {
-    const { layers } = art;
+    art.on('ready', () => {
+        art.layers.add({
+            name: 'miniProgressBar',
+            mounted($progressBar) {
+                art.on('destroy', () => {
+                    $progressBar.style.display = 'none';
+                });
 
-    layers.add({
-        name: 'miniProgressBar',
-        mounted($progressBar) {
-            art.on('destroy', () => {
-                $progressBar.style.display = 'none';
-            });
-
-            art.on('video:timeupdate', () => {
-                $progressBar.style.width = `${art.played * 100}%`;
-            });
-        },
+                art.on('video:timeupdate', () => {
+                    $progressBar.style.width = `${art.played * 100}%`;
+                });
+            },
+        });
     });
 
     return {