<button ng-click="reset(); form.$setPristine()">RESET</button>
<button ng-click="update(user); form.$setPristine()">SAVE</button>

或者您可以在控制器中调用该方法(确保表单存在后)：

$scope.update = function(user) {
    $scope.master= angular.copy(user);
    if ($scope.form) $scope.form.$setPristine();
  };

  $scope.reset = function() {
    $scope.user = angular.copy($scope.master);
    if ($scope.form) $scope.form.$setPristine();
  };

演示：http://plnkr.co/edit/Mau7uuDfPlzcn418OdWh?p=preview