removeClass() if it exists

You can use .toggleClass()

$('#btnDiv').toggleClass('rotated');

That adds it if it's missing, and removes it if it's present. There's also .is() to check for things like that:

if ($('#btnDiv').is('.rotated'))

or more simply:

if ($('#btnDiv').hasClass('rotated'))

Just use .toggleClass() to acheive that.

Try this

if($('#btnDiv').hasClass('rotated')){
   $('#btnDiv').removeClass('rotated')
}else{
  $('#btnDiv').addClass('rotated')
}

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