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Copy path固定导航栏.html
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固定导航栏.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0
}
img {
vertical-align: top;
}
.main {
margin: 0 auto;
width: 1000px;
margin-top: 10px;
}
.fixed {
position: fixed;
top: 0;
left: 0;
}
.top {
margin: 0 auto;
width: 1423px;
}
.nav {
width: 100%;
}
#navBar {
width: 1423px;
margin: 0 auto;
}
</style>
</head>
<body>
<div class="top" id="topPart">
<img src="img/top.png" alt=""/>
</div>
<div class="nav" id="nav">
<div id="navBar">
<img src="img/nav.png" alt=""/>
</div>
</div>
<div class="main" id="mainPart">
<img src="img/main.png" alt=""/>
</div>
<script>
var topPart=document.getElementById("topPart");
var nav=document.getElementById("nav");
var navBar=nav.children[0];
var mainPart=document.getElementById("mainPart");
function getScroll(){
return {
top:window.pageYOffset||document.documentElement.scrollTop||document.body.scrollTop||0,
left:window.pageXOffset||document.documentElement.scrollLeft||document.body.scrollLeft||0
}
}
window.onscroll=function(){
var scrollTop=getScroll().top;
var maxHeight=topPart.offsetHeight+nav.offsetHeight;
if(scrollTop>=maxHeight){
nav.className="nav fixed";
mainPart.style.paddingTop=nav.offsetHeight+"px";
}else{
nav.className="nav";
mainPart.style.paddingTop=0+"px";
}
}
</script>
</body>
</html>