Use JQUERY to achieve variable transparency return to top effect-CSS Tutorial-php.cn

Use JQUERY to achieve variable transparency return to top effect

一个新手

Release： 2017-09-08 14:17:13

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1. Add the A tag to the page (HTML) (return to the top hyperlink)

1	`<a href="#0"` `class="cd-top">Top</a>`

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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;
  }
}

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3. Add js code (before adding js, you must first reference the jquery library, otherwise it will be invalid)

1	`<script type="text/javascript"` `src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>`

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$(document).ready(function($){
    // 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 = $(&#39;.cd-top&#39;);
 
    //hide or show the "back to top" link
    $(window).scroll(function(){
        ( $(this).scrollTop() > offset ) ? $back_to_top.addClass(&#39;cd-is-visible&#39;) : $back_to_top.removeClass(&#39;cd-is-visible cd-fade-out&#39;);
        if( $(this).scrollTop() > offset_opacity ) { 
            $back_to_top.addClass(&#39;cd-fade-out&#39;);
        }
    });
    //www.sucaijiayuan.com
    //smooth scroll to top
    $back_to_top.on(&#39;click&#39;, function(event){
        event.preventDefault();
        $(&#39;body,html&#39;).animate({
            scrollTop: 0 ,
            }, scroll_top_duration
        );
    });
 
});

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