<script src="jquery.js"></script>
<script src="jquery.validate.js"></script>
<script src="jquery.validate.min.js"></script>
<script>
var validationSettings = {
validClass: "is-valid",
errorClass: "is-invalid"
};
$.validator.setDefaults(validationSettings);
$.validator.unobtrusive.options = validationSettings;
</script>