V5 (#509)

* update artplayer.d.ts

* update variables.less

* update artplayerPluginControl

* build:all

* update docs

* update docs

* update docs

* Update layers.md

* update index.js

* update docs

* update docs

packages/artplayer/src/index.js

@@ -33,10 +33,7 @@ export default class Artplayer extends Emitter {
         this.id = ++id;
 
         const mergeOption = utils.mergeDeep(Artplayer.option, option);
-
-        if (option.container instanceof Element) {
-            mergeOption.container = option.container;
-        }
+        mergeOption.container = option.container;
 
         this.option = validator(mergeOption, scheme);