移动端回到顶部

html:

<a href="javascript:goTop();" class="gotop"><img src="__STATIC__/images/topup.png"></a>

css:

.gotop{
    display: block;
    width: 40px;
    height: 40px;
    position: fixed;
    bottom: 70px;
    right: 8px;
    background-color: rgba(243,241,241,0.5);
    border: 1px solid #CCC;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
}
.gotop img{
    display: block;
    width: 40px;
    height: 40px;
}

js:

<script src="__STATIC__/js/jquery-3.1.1.min.js" type="text/javascript" charset="utf-8"></script>

<script>
        function goTop(){
            $('html,body').animate({'scrollTop':0},600);
        }
</script>