contact form email doesn't have the message from a textarea input

<form onsubmit="emailSend(); reset(); return false;">
                    <input type="text" id="name" name="name" placeholder="Name" required>
                    <input type="email" id="email" name="email" placeholder="E-Mail" required>
                    <textarea rows="5" id="message" cols="60" name="message" placeholder="Message" autocomplete="off" required></textarea>
                    <button type="submit" class="submit-button">Send message</button>

var userName = document.getElementById('name').value;
    var email = document.getElementById('email').value;
    var message = document.getElementById('message').value;
    var messageBody = "Name " + userName +
    "<br/> Email " + email;
    "<br/> Message " + message;