(PCC)::[How-to-use-comments-in-JavaScript]::[js]
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Comments are NOT Executed</h2>
<p id="demo"></p>
<script>
var x;
x = 5;
// x = 6; I will not be executed
document.getElementById("demo").innerHTML = x;
</script>
</body>
</html>