js implementation of floating back to top button example

js implementation of floating back to top button example_javascript skills

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Release： 2016-05-16 16:00:44

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The example in this article describes the method of implementing a floating back to top button using js. Share it with everyone for your reference. The specific implementation method is 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>漂浮回顶部按钮</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>
<!--拖动滚动条或滚动鼠标轮-->
window.onscroll=function(){
if(document.body.scrollTop||document.documentElement.scrollTop>0){
document.getElementById('rTop').style.display="block"
}else{
document.getElementById('rTop').style.display="none"
}
}
<!--点击“回到顶部”按钮-->
function toTop(){
window.scrollTo('0','0');
document.getElementById('rTop').style.display="none"
}
</script>
</head>
<body>
<div class="rTop" id="rTop" onClick="toTop()">返回顶部</div>
<h1>顶部</h1>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>测试</h1><p></p><h1>测试</h1><p></p><h1>测试</h1><p></p>
<h1>底部</h1>
</body>
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.