Pull request #3701: KERNEL-16950 fix: 内存泄露问题

Merge in VISUAL/fineui from ~IMP/fineui_fui:master to master

* commit '0e8e943686002bfdc88957f11bea3ec2ea5a63b1':
  KERNEL-16950 fix: 内存泄露问题

packages/fineui/src/fix/fix.js

@@ -1380,10 +1380,13 @@ class Model {
             });
         });
         this._watchers && (this._watchers = []);
+        this._computedWatchers && (this._computedWatchers = []);
         this.destroyed && this.destroyed();
         this.$$model = null;
         this.$$computed = null;
         this.$$state = null;
+        this.$$context = null;
+        this.model = null;
         this._destroyHandler && this._destroyHandler();
     }
 }