<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
body{
font-size:80px;
margin:0;
padding:0;
}
.fl{
float:left;
width: 70%;
height: 2210px;
background: pink;
}
.fr{
float:right;
width: 29%;
height: 1000px;
background: cyan;
}
</style>
</head>
<body>
<div class="fl">左边
<div style="color:red">1</div>
<div style="color:orange">2</div>
<div style="color:red">3</div>
<div style="color:orange">4</div>
<div style="color:red">5</div>
<div style="color:blue">6</div>
<div style="color:orange">7</div>
<div style="color:red">8</div>
<div style="color:orange">9</div>
<div style="color:white">10</div>
<div style="color:orange">11</div>
<div style="color:red">12</div>
<div style="color:green">13</div>
<div style="color:red">14</div>
<div style="color:orange">15</div>
<div style="color:red">16</div>
<div style="color:orange">17</div>
<div style="color:red">18</div>
<div style="color:white">19</div>
<div style="color:orange">20</div>
</div>
<div class="fr">右边
<div style="color:red">1</div>
<div style="color:orange">2</div>
<div style="color:red">3</div>
<div style="color:orange">4</div>
<div style="color:red">5</div>
<div style="color:blue">6</div>
<div style="color:orange">7</div>
<div style="color:red">8</div>
</div>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery.17.js"></script>
<script>
var sideHeight=$(".fr").height();//侧边栏的高度
$(window).scroll(function(){
var height=$(window).height();//显示的窗口的高度
var scrollTop=0;
//为了兼容IE/谷歌/火狐
if($("body,html").scrollTop()>0){
scrollTop=$("body,html").scrollTop();
}else{
scrollTop=$("body").scrollTop();
}
if(scrollTop+height>sideHeight){
$(".fr").css({
"position":"fixed",
"right":0,
"bottom":0
});
}else{
$(".fr").css({
"position":"static",
});
}
})
</script>
</body>
</html>
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