jQuery - 响应式回顶部按钮

js 代码

$(document).ready(function($){
    // 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 = 800,
        //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
        );
    });
});

html 代码

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

css 代码

.cd-top {
    z-index: 9999;
    display: inline-block;
    border-radius: 3px;
    height: 38px;
    width: 38px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,.05);
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    background: #FBE251 url(http://omuy6viz3.bkt.clouddn.com/2017/04/217036514.svg) no-repeat center 50%;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: all .3s;
    -moz-transition: all .3s;
    transition: all .3s
}
.cd-top.cd-is-visible {
    visibility: visible;
    opacity: .85
}
.cd-top.cd-is-visible:hover {
    visibility: visible;
    background: #2EA9DF url(http://omuy6viz3.bkt.clouddn.com/2017/04/217036514.svg) no-repeat center 50%;
    opacity: 1
}
.cd-top.cd-fade-out {
    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: 38px;
        width: 38px;
        right: 30px;
        bottom: 30px
    }
}

更多效果请查看 这里
参考自 门素材
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