http://v2ex.com/t/88070

gistfile1.js

ChildCtrl = function($scope) {
	$scope.validate = function() {
		//...
	}
 
	$scope.edit = function(item) {
	  parentValidateFn = $scope.$parent.validate;
	  $scope.$parent.validate = $scope.validate(); // 覆盖父类的方法
	  $scope.$parent.edit(item);
	  $scope.$parent.validate = parentValidateFn;
		
	}
}