How to add "Not Found" text into empty div or by specific class in jquery?

How to add "Not Found" text into empty div or by specific class in jquery?

Add Not Found text into empty div or by specific class in jquery

<!DOCTYPE html>

<html>

<head>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<script>

$(document).ready(function(){

var not_found_dt = "<div class='not_found_dt'>Not Found</div>";

var demo_str = $('#demo').text();

demo_str = demo_str.replace(/\s/g, '');

if(demo_str.length == 0){

$('#demo').html(not_found_dt);

}

});

</script>

</script>

</head>

<body>

<div id="demo"></div>

</body>

</html>

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