Use JQUERY to achieve variable transparency return to top effect
1. Add the A tag to the page (HTML)
(return to the top hyperlink)<a href="#0" class="cd-top">Top</a>
2. Add css style (can be written in the page, or Written in a separate css style sheet)
.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; } }
3. Add js code (before adding js, you must first reference the jquery library, otherwise it will be invalid)
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
$(document).ready(function($){ // browser window scroll (in pixels) after which the "back to top" link is shown var offset = 300, //browser window scroll (in pixels) after which the "back to top" link opacity is reduced offset_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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