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Using jquery to achieve variable transparency returns top effect

Source: Internet
Author: User
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1. Add a tag to the page (HTML) <body></body> (back to top hyperlink) 

<a href= "#0" class= "Cd-top" >Top</a>

2, add CSS style (can be written in the page, can also be written in a separate CSS style table)

. 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, 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 {  /* If the user continues to scroll down, the transparency of this button becomes lower *  /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, must first refer to the jquery library, otherwise it will expire)

<script type= "Text/javascript" src= "http://apps.bdimg.com/libs/jquery/ 2.1.4/jquery.min.js "></SCRIPT> 
$ (document). Ready (function ($) {//browser window scroll (in pixels) after which The "Back to Top" link was shownvar offset = 300,//browser window scroll (in pixels) after which the ' back to top ' link OPA  City was reducedoffset_opacity = 1200,//duration of the top scrolling animation (in ms) Scroll_top_duration = 700,//grab the "Back to top" Link$back_to_top = $ ('. Cd-top '),//hide or show the "Back to Top" link$ (Windows). Scroll (function () {($ (this). ScrollTop () > Offset)? $back _to_top.addclass (' cd-is-visible '): $back _to_top.removeclass (' cd-is-visible cd-fade-out '); ScrollTop () > Offset_opacity) {$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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