Pull request #3702: 无JIRA 组件销毁的时候ref处理

Merge in VISUAL/fineui from ~DAILER/fineui:master to master

* commit '9fd1fd58fb59cd772813728d0dfb6957bf04177d':
  无JIRA 组件销毁的时候ref处理

packages/fineui/src/core/4.widget.js

@@ -868,13 +868,13 @@ export class Widget extends OB {
         callLifeHook(this, "destroyed");
         this.destroyed = null;
         this._isDestroyed = true;
-        // this._purgeRef();  // 清除ref的时机还是要仔细考虑一下
     }
 
     _unMount() {
         this._assetMounted();
         this.__destroy();
         this.fireEvent(Events.UNMOUNT);
+        this._purgeRef();
         this.purgeListeners();
     }