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Copy path滚动监听显示
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滚动监听显示
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<!DOCTYPE html>
<html>
<head>
<title>fixed</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style>
#fixed{ position:fixed; top:30px; display:none;}
</style>
<script>
window.onload=function(){
window.onscroll=function top(){
if(document.documentElement.scrollTop+document.body.scrollTop<400){
document.getElementById("fixed").style.display="none";
}else{
document.getElementById("fixed").style.display="block";
}
}
}
</script>
</head>
<body>
<div id="fixed">123</div>
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</body>
</html>