<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script> <script> $(document).ready(function(){ // hide #back-top first $("#back-top").hide(); // fade in #back-top $(function () { $(window).scroll(function () { if ($(this).scrollTop() > 100) { $('#back-top').fadeIn(); } else { $('#back-top').fadeOut(); } }); // scroll body to 0px on click $('#back-top a').click(function () { $('body,html').animate({ scrollTop: 0 }, 800); return false; }); }); }); </script>
滚动页面到顶部的动画
