js implements float back to top button instance
- 2020-06-03 05:53:06
- OfStack
This article illustrates how js can float back to the top button. Share to everybody for everybody reference. Specific implementation methods are as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> Float back to the top button </title>
<style>
body{
height:2000px;
}
.rTop{
width:100px; height:25px;
text-align:center; font-size:small;
line-height:25px; border:1px solid #999;
position:fixed; right:0; bottom:0;
border-bottom-color:#333;
border-right-color:#333; margin:5px;
cursor:pointer; display:none
}
</style>
<script>
<!-- Drag the scroll bar or scroll the mouse wheel -->
window.onscroll=function(){
if(document.body.scrollTop||document.documentElement.scrollTop>0){
document.getElementById('rTop').style.display="block"
}else{
document.getElementById('rTop').style.display="none"
}
}
<!-- Click the back to top button -->
function toTop(){
window.scrollTo('0','0');
document.getElementById('rTop').style.display="none"
}
</script>
</head>
<body>
<div class="rTop" id="rTop" onClick="toTop()"> Return to the top </div>
<h1> At the top of the </h1>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> test </h1><p></p><h1> test </h1><p></p><h1> test </h1><p></p>
<h1> At the bottom of the </h1>
</body>
</html>Hopefully, this article has been helpful in your javascript programming.