javascript - going to first div after scroll going to top of the last div -

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i have problem scrolling. when clicking on <a href="#" id="display" class="display">next</a> tag, page scrolls next div. when scrolling top of last div , clicking "next", must go top of first div, doesn't.

demo

modified code:

  if (t === 'next' ) {     if($('.current').next('.section').length==0)     var $next = $('#one');     else     var $next = $('.current').next('.section');   }

working demo


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