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$('.navbar-toggle.collapsed').click(function(){
  
  $('#nav').toggleClass('opened');
  $(this).toggleClass('collapsed');
  
});

.navbar-brand {
    float: left;
    font-size: 18px;
    height: 50px;
    line-height: 20px;
    padding: 15px;
}
.sr-only {
    border: 0 none;
    clip: rect(0px, 0px, 0px, 0px);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}
.navbar-toggle .icon-bar {
    background-color: #fff;
    border-radius: 1px;
    display: block;
    height: 2px;
    width: 22px;
}
.bs-docs-nav .navbar-toggle .icon-bar {
}
.bs-docs-nav .navbar-toggle .icon-bar {
    background-color: #999;
}
.navbar-toggle {
    background-color: #bc0b3b;
    background-image: none;
    border: 1px solid transparent;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 15px;
    margin-top: 8px;
    overflow: visible;
    padding: 9px 10px;
    position: absolute;
    right: 1px;
    top: 1px;
}
*::after, *::before {
    box-sizing: border-box;
}
.navbar-toggle .icon-bar + .icon-bar {
    margin-top: 4px;
}
.navbar-toggle {
    background: none repeat scroll 0 0 #bc0b3b;
}
.navbar-toggle:hover {
    background-color: #999;
}

<button class="navbar-toggle collapsed" type="button" data-toggle="collapse" data-target=".bs-navbar-collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
</button>