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<html>
<head>
<title>导航栏跟随</title>
<meta charest="utf-8">
<style>
*{margin: 0;padding: 0;}
#content{height: 2000px;}
#head{ height: 300px; width: 100px; background: gray; position: absolute;}
</style>
<script>
window.onload=function(){
var oHead=document.getElementById('head');
var h=document.body.clientHeight/2 -150;
oHead.style.top =h+ 'px';
document.onscroll=function(){
var top=document.body.scrollTop || document.documentElement.scrollTop;
var left=document.body.scrollLeft || document.documentElement.scrollLeft;
oHead.style.top =h+top + 'px';
oHead.style.left =left + 'px';
}
}
</script>
</head>
<body>
<div id='content'>
<div id='head'> 向所有辛勤的程序员致敬! </div>
</div>
</body>
</html>