Bootstrap 3.0 - Keep Dropdown Open

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css">
<div class="navbar-default pull-left">
	<div class="maxWidthContainer">
		<nav class="navbar" role="navigation">
			<div class="navbar-header">
            <button id="menuBtn" type="button" class="navbar-toggle" data-toggle="collapse" data-target="#menu">
				<span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
				<span class="icon-bar"></span>
				<span class="icon-bar"></span>
            </button>
			</div>
            
            
            <div class="collapse navbar-collapse " id="menu">
                <ul class="nav navbar-nav">
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Menu A<b class="caret"></b></a>
                        <ul id="dropdown-menu1" class="dropdown-menu">
                            <li><a href="#">link 1</a></li>
                            <li><a href="#">link 2</a></li>
                            <li><a href="#">link 3</a></li>
                        </ul>
                    </li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Menu B<b class="caret"></b></a>
                        <ul id="dropdown-menu2" class="dropdown-menu">
                            <li><a href="#">link 3</a></li>
                            <li><a href="#">link 4</a></li>
                            <li><a href="#">link 5</a></li>
                        </ul>
                    </li>
                </ul>
			</div>
		</nav>
	</div>
</div>

JavaScript

$(function () {
    $('#menuBtn').on('click', function() {
         $('#dropdown-menu1').dropdown('toggle');               
    });
});