Checkout these
Using JS
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<select id="lstProfLstS1" ></select>
<script>
var Val1 = 'aravind';
var opt1 = document.createElement("option");
opt1.text = Val1;
opt1.value = Val1;
document.getElementById("lstProfLstS1").options.add(opt1);
</script>
</body>
</html>
Using JQuery
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="https://code.jquery.com/jquery-3.3.1.min.js" ></script>
<script>
$(function () {
var value = 'aravind';
var listBox = $("#lstProfLstS1");
var option = $("<option />").val(value).text(value);
listBox.append(option);
});
</script>
</head>
<body>
<select id="lstProfLstS1"></select>
</body>
</html>