<a href="#" title="logout" class="exit">logout</a>

func logOut() {

    webView.evaluateJavaScript("document.querySelector('#header > div > a.exit').click()", completionHandler: { (result, error) in

        if error != nil {
            print("Logout error - (error?.localizedDescription)")
        } else {
            print("Logout ok! (result)")
        }
    })

    self.webView.reloadFromOrigin()
}