how to get the class name dynamically using jquery

1$(document).ready(function () {
2    var $allClasses = $("[name='submit']").attr('class').split(' ');
3    for(var i=0; i < $allClasses.length; i++)
4    {
5        // Check $allClasses[i] here.
6    }
7});
8

1 $('.setvalue').on('click', function() {
2       var id = $(this).data("id");
3       var inp =  $('#applicantstatus_' + id).val();

1<input id="btn" class="wpsc-buy-now-button wpsc-buy-now-button-64" type="image"
2    name="submit" border="0" src="https://www.paypal.com/en_US/i/btn/btn_buynow_LG.gif"
3    alt="PayPal - The safer, easier way to pay online" />
4

1var id = $(this).attr("id")

1$('.' + $classOfBtn) //note the dot
2

1var classArray = $('input').attr('class').split(' ');
2// So now you can declare variables
3var classbtn1 = classArray[0];
4var classbtn2 = classArray[1];
5

1var $classOfBtn = wpsc-buy-now-button-64;
2

1var $classOfBtn = 'wpsc-buy-now-button-64';
2

1var className = $('#id').attr('class');
2

1$(document).ready(function () {
2    var $classOfBtn = $('#btn').attr('class').split(' ')[0] + '-64';
3    alert($classOfBtn );
4});
5