层使用异步加载

packages/artplayer/src/layers.js

@@ -6,8 +6,10 @@ export default class Layers {
         this.id = 0;
         this.art = art;
         this.add = this.add.bind(this);
-        this.art.option.layers.forEach(item => {
-            this.add(item);
+        this.art.on('firstCanplay', () => {
+            this.art.option.layers.forEach(item => {
+                this.add(item);
+            });
         });
     }