<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<input type="password" name="password" id="password">
<button onclick="lihat()">lihat</button>
<script>
function lihat() {
var x = document.getElementById("password").getAttribute("type");
if(x=="password")
{document.getElementById("password").setAttribute("type", "text"); }
if(x=="text")
{document.getElementById("password").setAttribute("type", "password"); }
}
</script>
