Getting a value from an input using jQuery

gistfile1.html

<input type="text" name="message">

<button type="button" class="show-message">Show The Message...</button>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script type="text/javascript">
    // wait for someone to click on a button
    $(".show-message").click(function() {
        // get the value of the input, and show it in a dialog
        alert( $("input[name='message'").val() );
    });  
</script>