jQuery addClass example
Change class name on click in jQuery
by Mateus Junges
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.mask/1.14.15/jquery.mask.js"></script>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
<br>
<div class="input-group mb-3">
<div class="input-group-prepend">
<span class="input-group-text" id="valor">Valor</span>
</div>
<input type="text" class="form-control" placeholder="Valor Contrato" aria-label="Valor Contrato" aria-describedby="basic-addon1" id="valor_contrato">
</div>
</body>
</html>
JavaScript
$(document).ready(function(){
$('#valor_contrato').mask('000.000.000,00');
});