js代码
<script type="text/javascript" src="js/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(e) { t = $('.fixed').offset().top; mh = $('.main').height(); fh = $('.fixed').height(); $(window).scroll(function(e){ s = $(document).scrollTop(); if(s > t - 10){ $('.fixed').css('position','fixed'); if(s + fh > mh){ $('.fixed').css('top',mh-s-fh+'px'); } }else{ $('.fixed').css('position',''); } }) }); </script>
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