From dc2e736e5793db53768c6f4bf0f121c33b3c6dce Mon Sep 17 00:00:00 2001
From: livelazily <livelazily@gmail.com>
Date: Thu, 7 Jan 2016 11:40:04 +0800
Subject: [PATCH] `scope` does not has "off" function

---
 ng-sortable.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ng-sortable.js b/ng-sortable.js
index 87bdc58..2b667b9 100644
--- a/ng-sortable.js
+++ b/ng-sortable.js
@@ -71,6 +71,7 @@
 						options = angular.extend(scope.ngSortable || {}, ngSortableConfig),
 						watchers = [],
 						getSource = getSourceFactory(el, scope),
+						offDestroy,
 						sortable
 					;
 
@@ -127,7 +128,7 @@
 					}
 
 					function _destroy() {
-						scope.$off('$destroy', _destroy);
+						offDestroy();
 
 						angular.forEach(watchers, function (/** Function */unwatch) {
 							unwatch();
@@ -190,7 +191,7 @@
 						}));
 					});
 
-					scope.$on('$destroy', _destroy);
+					offDestroy = scope.$on('$destroy', _destroy);
 				}
 			};
 		}]);