update docs

packages/artplayer-document/docs/en/Class.mdx

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+---
+title: Static propertys
+sidebar_position: 5
+slug: /class
+---
+
+:::tip Tip
+
+Static attributes exist in the constructor artplayer, and the player instance is not directly associated
+
+:::
+
+## instances
+
+-   Type: `Array`
+
+A array that saves all player instances, and can manage multiple instances through this property when multiple players exist at the same time.
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+var art = new Artplayer({
+    container: '.artplayer-app',
+    url: '/assets/sample/video.mp4',
+});
+
+art.on('ready', () => {
+    console.info(Artplayer.instances.length);
+});
+```
+
+## version
+
+-   Type: `String`
+
+Current player version number
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.version);
+```
+
+## env
+
+-   Type: `String`
+
+Current player environment variable
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.env);
+```
+
+## utils
+
+-   Type: `Object`
+
+Common utils for player
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Object.keys(Artplayer.utils));
+```
+
+## config
+
+-   Type: `Object`
+
+Store native properties and methods of video
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.config);
+```
+
+## scheme
+
+-   Type: `Object`
+
+Verification scheme for player option
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.scheme);
+```
+
+## validator
+
+-   Type: `Function`
+
+Validator for player option
+
+## option
+
+-   Type: `Object`
+
+Player default option
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.option);
+```
+
+## html
+
+-   Type: `String`
+
+Player defaults `HTML` String, usually used for `SSR`
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.html);
+```
+
+## kindOf
+
+-   Type: `Function`
+
+JS type identification function
+
+<div className="run-code">▶ Run Code</div>
+
+```js
+console.info(Artplayer.kindOf('0'));
+console.info(Artplayer.kindOf(0));
+console.info(Artplayer.kindOf({}));
+console.info(Artplayer.kindOf([]));
+```