winch,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
.right{
margin:100px;
}
.left{
margin:0px
}
.animate {
transition: all 1s;
}
.hot{
border: 8px dashed Gray; padding: 5px; height: 100px; width: 100px;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
var cls = ["left","right"];
$(".hot").on("click" , function() {
$(this).removeClass(cls.reverse().join(" ")).addClass("animate "+cls[0])
})
});
</script>
</head>
<body>
<style type="text/css">
</style>
<div class="hot">click me</div>
</body>
</html>