How to toogle element attribute javascript and jquery

For Example Write this Input type in your code

<input type="button" id="marqbt" value="Play"/>

Add this script in your script file or header or footer file

<script>

$(function(){$('#marqbt').click(function() {
       $(this).val() == "play" ? play_int() : play_pause();
    });
});


function play_int() {
    $('#marqbt').val("pause");
    // do play
}

function play_pause() {
    $('#marqbt').val("play");
    // do pause
}

</script>

Now you can change button value when you click on this