<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<meta charset="utf-8" />
<script src="Content/jquery-1.10.2.min.js"></script>
</head>
<body>
<div id="content">
<div id="divLeft" style="float:left;width:200px;height:300px;">
<div style="position:fixed">
<a href="#p1">这里是1</a><br />
<a href="#p2">这里是2</a><br />
<a href="#p3">这里是3</a><br />
<a href="#p4">这里是4</a><br />
<a href="#p5">这里是5</a><br />
<a href="#p6">这里是6</a><br />
<a href="#p7">这里是7</a><br />
<a href="#p8">这里是8</a><br />
<a href="#p9">这里是9</a><br />
<a href="#p10">这里是10</a>
</div>
</div>
<div id="divRight" style="float:left;">
<div id="p1" style="height:300px;width:100%;border:1px solid red;">这里是1</div>
<div id="p2" style="height:300px;width:100%;border:1px solid red;">这里是2</div>
<div id="p3" style="height:300px;width:100%;border:1px solid red;">这里是3</div>
<div id="p4" style="height:300px;width:100%;border:1px solid red;">这里是4</div>
<div id="p5" style="height:300px;width:100%;border:1px solid red;">这里是5</div>
<div id="p6" style="height:300px;width:100%;border:1px solid red;">这里是6</div>
<div id="p7" style="height:300px;width:100%;border:1px solid red;">这里是7</div>
<div id="p8" style="height:300px;width:100%;border:1px solid red;">这里是8</div>
<div id="p9" style="height:300px;width:100%;border:1px solid red;">这里是9</div>
<div id="p10" style="height:300px;width:100%;border:1px solid red;">这里是10</div>
</div>
</div>
<script>
function ChangeColor(index) {
var aArray = $('#divLeft a');
for (var i = 0; i < aArray.length; i++) {
if (i == parseInt(index)) {
aArray.eq(i).css('color','red')
} else {
aArray.eq(i).css('color', 'black')
}
}
}
function getScrollTop() {
var scrollTop = 0;
if (document.documentElement && document.documentElement.scrollTop) {
scrollTop = document.documentElement.scrollTop;
} else if (document.body) {
scrollTop = document.body.scrollTop;
}
var t = scrollTop / 300;
ChangeColor(t);
return scrollTop;
}
document.onscroll = function () {
getScrollTop()
}
</script>
</body>
</html>
https://www.cnblogs.com/ligenyun/p/9186560.html