Pull request #1926: 无JIRA任务 bugfix

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

* commit '7dd010b0f654e6aefa389f4c3dae77f7e66bb643':
  bugfix

src/core/4.widget.js

@@ -574,6 +574,7 @@
             if (this.__async === true || this.__asking === true) {
                 return;
             }
+            this._isMounted = false;
             // this.purgeListeners();
             this.empty();
             this._initCurrent();