Update class.md

docs/document/class.md

@@ -2,46 +2,56 @@
 
 -   Type: `String`
 
+Return the player's version number
+
 [Run Code](/Class.version)
 
 ```js
-console.log(Artplayer.version);
+console.info(Artplayer.version);
 ```
 
 ## env
 
 -   Type: `String`
 
+Return to the player's code environment: `development` or `production`
+
 [Run Code](/Class.env)
 
 ```js
-console.log(Artplayer.env);
+console.info(Artplayer.env);
 ```
 
 ## config
 
 -   Type: `Object`
 
+Return all available `propertys`, `methods` and `events` of the `video` element
+
 [Run Code](/Class.config)
 
 ```js
-console.log(Artplayer.config);
+console.info(Artplayer.config);
 ```
 
 ## utils
 
 -   Type: `Object`
 
+Return all functional tools for development
+
 [Run Code](/Class.utils)
 
 ```js
-console.log(Artplayer.utils);
+console.info(Object.keys(Artplayer.utils));
 ```
 
 ## option
 
 -   Type: `Object`
 
+Return to default player options
+
 [Run Code](/Class.option)
 
 ```js
@@ -52,6 +62,8 @@ console.log(Artplayer.option);
 
 -   Type: `Array`
 
+Return an array of all player instances
+
 [Run Code](/Class.instances)
 
 ```js
@@ -62,26 +74,20 @@ console.log(Artplayer.instances.length);
 
 -   Type: `Object`
 
+Return the scheme used to verify player options
+
 [Run Code](/Class.scheme)
 
 ```js
 console.log(Artplayer.scheme);
 ```
 
-## Emitter
-
--   Type: `Function`
-
-[Run Code](/Class.Emitter)
-
-```js
-console.log(Artplayer.Emitter);
-```
-
 ## validator
 
 -   Type: `Function`
 
+Return validator: [https://github.com/zhw2590582/option-validator](https://github.com/zhw2590582/option-validator)
+
 [Run Code](/Class.validator)
 
 ```js
@@ -92,6 +98,8 @@ console.log(Artplayer.validator);
 
 -   Type: `Function`
 
+Return type judgment function: [https://github.com/jonschlinkert/kind-of](https://github.com/jonschlinkert/kind-of)
+
 [Run Code](/Class.kindOf)
 
 ```js