javascript - Failed to execute 'scroll' on 'Window': 2 arguments required, but only 1 present -


i have code here, gives me error.

uncaught typeerror: failed execute 'scroll' on 'window': 2 arguments required, 1 present.

i have jquery 1.8.3 installed, , script on bottom of page. code:

<script type='text/javascript'>     $(window).scroll(function() {             var scroll = $(window).scrolltop();          if (scroll >= 150) {             $(".navigation").addclass("darkheader");         } else {             $(".navigation").removeclass("darkheader");         }     });     </script>

any help? on jsfiddle working. code on ipboard 3.4.8.

use 

  $(document).ready(function(){      }

to element after document ready

here demo

click here!

update demo notice change of scroll

click here!


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