fix setting add

packages/artplayer/src/setting/index.js

@@ -93,12 +93,12 @@ export default class Setting extends Component {
             this.art.events.remove(this.events[index]);
         }
         this.$parent.innerHTML = '';
+        this.events = [];
+        this.cache = new Map();
     }
 
     update(settings) {
         this.remove();
-        this.events = [];
-        this.cache = new Map();
         const settingsCopy = settings.map((item) => mergeDeep({}, item));
         const mergeSettings = [...this.defaultSettings, ...settingsCopy];
         this.option = Setting.makeRecursion(mergeSettings);
@@ -107,8 +107,11 @@ export default class Setting extends Component {
     }
 
     add(setting) {
+        this.remove();
         this.option.push(setting);
-        return this.update(this.option);
+        this.option = Setting.makeRecursion(this.option);
+        this.render(this.option);
+        return this.option;
     }
 
     creatHeader(item) {