Put method in Angular

问题

I have a expressjs controller

exports.update = function(req, res, next) {
var id = req.params.id
User.findByIdAndUpdate(id, req.body, function(err, user) {
    if (err) {
        return next(err);
    } else {
        res.json(user);
    }
});
}

and a route

app.route('/api/users/:id').put(users.update);

which is working fine to update user with Postman. However, my frontend part

$scope.updateUser = function(id) {
    $http.put('/api/users/' + id, $scope.userData)
        .success(function(userData) {
            console.log(userData);
        })
        .error(function(data) {
            console.log('Error: ' + data);
        });
};

is not working on data-ng-click="updateUser(userData._id)" button within a form like

<input type="text" class="form-control input-xs" data-ng-model="userData.username">
<input type="text" class="form-control input-xs" data-ng-model="userData.email">

I get a PUT /api/users/551d468b53ac2cef3b000001 200 35.887 ms - 390 Response. Please note the form is in a modal box. with {{ index }}

<button type="button" data-toggle="modal" data-target="#actionModal{{$index}}" data-ng-click="Clear()"></button>

<div class="modal fade" id="actionModal{{$index}}" tabindex="-1" data-role="dialog">

来源：https://stackoverflow.com/questions/29431984/put-method-in-angular