How do I allow multiple domains for CORS in express in a simplified way.

I have

 cors: {

        origin: www.one.com;

    }



    app.all('*', function(req, res, next) {

            res.header(Access-Control-Allow-Origin, cors.origin);

            res.header(Access-Control-Allow-Headers, Origin, X-Requested-With, Content-Type, Accept);

            next();

        });

This works when there is only one domain mentioned in origin

But if I want to have origin as an array of domains and I want to allow CORS for all the domains in the origin array, I would have something like this -

cors: {

            origin: [www.one.com,www.two.com,www.three.com];

        }

But then the problem is this below code would not work -

app.all('*', function(req, res, next) {

                res.header(Access-Control-Allow-Origin, cors.origin);

                res.header(Access-Control-Allow-Headers, Origin, X-Requested-With, Content-Type, Accept);

                next();

            });

How do I make res.header take an array of domains via cors.origin ?