1、在页面(html)
里加上a标签(返回顶部超链接)
Top
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2、添加css样式(可以写在页面里,也可以写在单独的css样式表里)
.cd-top { display: inline-block; height: 40px; width: 40px; position: fixed; bottom: 40px; right: 10px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.05); /* image replacement properties */ overflow: hidden; text-indent: 100%; white-space: nowrap; background: rgba(232, 98, 86, 0.8) url(../images/cd-top-arrow.svg) no-repeat center 50%; visibility: hidden; opacity: 0; -webkit-transition: all 0.3s; -moz-transition: all 0.3s; transition: all 0.3s;}.cd-top.cd-is-visible { /* the button becomes visible */ visibility: visible; opacity: 1;}.cd-top.cd-fade-out { /* 如果用户继续向下滚动,这个按钮的透明度会变得更低 */ opacity: .5;}.no-touch .cd-top:hover { background-color: #e86256; opacity: 1;}@media only screen and (min-width: 768px) { .cd-top { right: 20px; bottom: 20px; }}@media only screen and (min-width: 1024px) { .cd-top { height: 60px; width: 60px; right: 30px; bottom: 30px; }}
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3、加入js代码(加入js前,一定要先引用jquery库,否则会失效)
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$(document).ready(function($){// browser window scroll (in pixels) after which the "back to top" link is shownvar offset = 300,//browser window scroll (in pixels) after which the "back to top" link opacity is reducedoffset_opacity = 1200,//duration of the top scrolling animation (in ms)scroll_top_duration = 700,//grab the "back to top" link$back_to_top = $('.cd-top');//hide or show the "back to top" link$(window).scroll(function(){( $(this).scrollTop() > offset ) ? $back_to_top.addClass('cd-is-visible') : $back_to_top.removeClass('cd-is-visible cd-fade-out');if( $(this).scrollTop() > offset_opacity ) { $back_to_top.addClass('cd-fade-out');}});//www.sucaijiayuan.com//smooth scroll to top$back_to_top.on('click', function(event){event.preventDefault();$('body,html').animate({scrollTop: 0 , }, scroll_top_duration);});});
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以上就是使用JQUERY实现可变透明度返回顶部效果的详细内容,更多请关注【创想鸟】其它相关文章!
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