jQuery实现返回顶部功能
编程学习 2021-07-04 21:04www.dzhlxh.cn编程入门
很多网站上都有返回顶部的效果,本文阐述如何使用jquery实现返回顶部按钮。希望大家能够喜欢
代码很简单,这里就不多废话了,小伙伴们看代码吧。
HTML:
<!--Go to Top--> <div id="Fixed"> <a id="goTop" class="fl" title="去顶部" href="javascript:;">去顶部</a> </div> <!--Go to Top end-->
CSS:
.fl{ display:block; float:left; width:50px; height:50px; text-align:center; background-color:#eaeaea; background-image:url(../images/toTop.png); } .fl:hover{background-color:#f48942;background-image:url(../images/toTop.png);} #Fixed { position: fixed; _position: absolute; z-index: 100; bottom: 70px; left: 50%; margin-left: 530px; _bottom: auto;_top: expression(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-70); width: 50px; text-indent: -40000px; background: #fff } /*置顶 end*/
Js:
/*置顶功能*/ $(function(){ $(window).bind('scroll', { fixedOffsetBottom: parseInt($('#Fixed').css('bottom')) }, function(e) { var scrollTop = $(window).scrollTop(); var referFooter =$('#footer'); scrollTop > 100 ? $('#goTop').show() : $('#goTop').hide(); if (!/msie 6/i.test(navigator.userAgent)) { if ($(window).height() - (referFooter.offset().top - $(window).scrollTop()) > e.data.fixedOffsetBottom) { $('#Fixed').css('bottom', $(window).height() - (referFooter.offset().top - $(window).scrollTop())) } else { $('#Fixed').css('bottom', e.data.fixedOffsetBottom) } } }); $('#goTop').click(function() { $('body,html').stop().animate({ 'scrollTop': 0, 'duration': 100, 'easing': 'ease-in' }) }); }); /*置顶功能 end*/