问使用angularjs复选框在ajax调用后不会更新

EN

          <input type="checkbox" 
          ng-change="defaultMsgsHandler(vuser.use_managed_default_msgs)" 
          ng-model="vuser.use_managed_default_msgs" 
          ng-true-value=1 ng-false-value=0>

    messageServices.getMessageSettingsInfo(user.dir)
                    .then(function(data) {
                        if (!data.success) {
                            $scope.errormessage = data.errors;
                        } else {
                            $scope.vuser = data.vuser;
                            $scope.messages = data.messages;
                        }
                    }, function(error) {
                        alert(error);
                    });

    $scope.defaultMsgsHandler = function( use_managed_default_msgs ){
        $scope.vuser.use_managed_default_msgs = use_managed_default_msgs;
    };