无JIRA 牵一发而动全身,先回滚

src/core/4.widget.js

@@ -739,12 +739,13 @@
             this.destroyed = null;
             this._isDestroyed = true;
             // this._purgeRef();  // 清除ref的时机还是要仔细考虑一下
-            this.purgeListeners();
+
         },
 
         _unMount: function () {
             this.__destroy();
             this.fireEvent(BI.Events.UNMOUNT);
+            this.purgeListeners();
         },
 
         _empty: function () {