update docs

packages/artplayer/src/player/autoHeightMix.js

@@ -1,32 +1,17 @@
-import { setStyle, hasClass, addClass, removeClass, def } from '../utils';
+import { setStyle, def } from '../utils';
 
 export default function autoHeightMix(art) {
     const {
-        option,
         template: { $container, $video },
     } = art;
 
-    const heightCache = $container.style.height;
-
     def(art, 'autoHeight', {
-        get() {
-            return hasClass($container, 'art-auto-height');
-        },
-        set(value) {
-            if (value) {
-                const { clientWidth } = $container;
-                const { videoHeight, videoWidth } = $video;
-                const height = videoHeight * (clientWidth / videoWidth);
-                setStyle($container, 'height', height + 'px');
-                addClass($container, 'art-auto-height');
-                art.autoSize = option.autoSize;
-                art.emit('autoHeight', height);
-            } else {
-                setStyle($container, 'height', heightCache);
-                removeClass($container, 'art-auto-height');
-                art.autoSize = option.autoSize;
-                art.emit('autoHeight');
-            }
+        value() {
+            const { clientWidth } = $container;
+            const { videoHeight, videoWidth } = $video;
+            const height = videoHeight * (clientWidth / videoWidth);
+            setStyle($container, 'height', height + 'px');
+            art.emit('autoHeight', height);
         },
     });
 }