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Dev. Web/JavaScript Jquery

JQuery Callback function -1

<!DOCTYPE html>

<html>

<head>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

<script>

$(document).ready(function(){

    $("#btn1").click(function(){

        $("#test1").text(function(i, origText){

            return "Old text: " + origText + " New text: Hello world! (index: " + i + ")"; 

        });

    });


    $("#btn2").click(function(){

        $("#test2").html(function(i, origText){

            return "Old html: " + origText + " New html: Hello <b>world!</b> (index: " + i + ")"; 

        });

    });

});

</script>

</head>

<body>


<p id="test1">This is a <b>bold</b> paragraph.</p>

<p id="test2">This is another <b>bold</b> paragraph.</p>


<button id="btn1">Show Old/New Text</button>

<button id="btn2">Show Old/New HTML</button>


</body>

</html>