How to Lock Blog Post

Here's the codes

<!--Lock code--><!--Powered by theAShub-->
<script language="JavaScript">
<!-- Begin
var password = 'cba'
password=prompt('Please enter the passcode to open it !','');
if (password != 'cba') {
location.href='https://theanuragsinghhub.blogspot.com/';
alert("Wrong password ! you will redirect to homepage")
}
// End -->
</script>