代码语言：javascript复制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>fix</title>
<style>
*{ margin: 0; padding: 0; }
.main{ width: 1200px; margin: 0 auto; height: 500px; border: 1px solid #ccc; }
.hh{ width: 15px; height: 60px; border: 1px solid #ccc; position: fixed;box-sizing: border-box; }
</style>
</head>
<body>
<div class="main"></div>
<div class="hh" style='right:342px;top:20px;'></div>
</body>
<script>
var hh = document.querySelector('.hh');
window.onload = function(){
var win = window.innerWidth;
hh.style.right=(win-1200)/2-18 'px'
}
window.onresize=function() {
var win = window.innerWidth;
hh.style.right=(win-1200)/2-18 'px'
}
</script>
</html>窗口宽度 版心宽度 除以 2 减去 侧边栏的宽度
更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/120055510
