jquery实现点击回到顶部
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>回到顶部</title>
<meta name="viewport" content="width=1200, maximum-scale=1.0, user-scalable=1">
<style>
.scrollToTop{
display: block;
width: 42px;
height: 42px;
position: fixed;
bottom: 5%;
right: 2%;
display: none;
font-size: 40px;
background: #232323;
color: #ebebeb;
border-radius: 3px;
text-align: center;
line-height: 38px;
z-index: 999;
}
.scrollToTop i img{margin:9px 0px 0px 2px;}
</style>
</head>
<body style="height:2000px">
<a href="#" title="sroll" class="scrollToTop"><i><img src="https://www.cnblogs.com/images/cnblogs_com/wrongcode/1426773/o_uptop0.png" alt=""></i></a>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
$(window).scroll(function() {
if ($(this).scrollTop() > 300) {
$('.scrollToTop').fadeIn();
} else {
$('.scrollToTop').fadeOut();
}
});
$('.scrollToTop').on("click", function() {
$('html, body').animate({
scrollTop: 0
}, 800);
return false;
});
</script>
</body>
</html>
