toggleclass

add and remove class on click

HTML

<div class="demo">demo</div>

CSS

.demo{
    background: red;
    width: 400px;
    padding: 10px;
    border: solid black 5px;
    position: fixed;
    height:10px;
}
.colored {
    background: green;
    width: 400px;
    padding: 10px;
    border: solid black 5px;
    height:10px
}

JavaScript

$('.demo').on('click', function (e) {
    $('.demo').toggleClass("colored"),
     $('.demo').link.text('close');
});