jQuery method to implement scrolling of specified content without scrolling on the left side or other places

The example in this article describes how jQuery implements scrolling of specified content without scrolling on the left side or other places. Share it with everyone for your reference. The details are as follows:
This effect can realize that the logo in the upper left corner is on top but does not scroll, and the text is scrolled in the main area of the web page. This effect can be seen when the user drags the scroll bar. The example is quite simple.
First take a look at the screenshot of the running effect:
The specific code is as follows:
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery跟随滚动的侧边条效果</title>
<style>
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video{margin: 0;padding: 0;border: 0;font-size: 100%;font: inherit;vertical-align: baseline;}
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section{display: block;}
body{line-height: 1;}
ol, ul{list-style: none;}
blockquote, q{quotes: none;}
blockquote: before, blockquote: after,
q: before, q: after{content: '';content: none;}
table{border-collapse: collapse;border-spacing: 0;}
a{text-decoration: none;}
body{background: url("http://files.jb51.net/file_images/article/201508/201588101650294.jpg") repeat scroll 0 0 transparent;font: 12px/20px "Helvetica Neue",Helvetica,Arial,sans-serif;}
p{line-height: 24px;margin: 0 0 15px 0;color: #fff;}
.header{color: #FFFFFF;font-size: 15em;height: 150px;letter-spacing: -10px;margin: 20px auto;clear: both;text-align: center;font-family: Georgia, "Times New Roman", Times, serif;}
.italic{font-style: italic;}
#sticky{margin-top: 50px;margin-left: 50px;padding: 5px;background: rgba(255,255,255,1);height: 120px;width: 305px;-webkit-border-radius: 7px;-moz-border-radius: 7px;border-radius: 7px;}
#sticky: hover{background: #6c6c6c;background: rgba(54,54,54,0.80);}
.sticky_text{color: #ffffff;text-align: center;font-size: 16px;line-height: 20px;padding-top: 10px;}
#text, h1{color: #fff;margin: 0 auto;font-size: 1.2em;line-height: 23px;width: 500px;}
h1,h2{font-weight: bold;line-height: 50px;}
a{color: #e3e3e3;}
a: hover{color: #ccc;}
#container{width: 744px;}
.menu{float: left;}
.button{-moz-box-shadow: inset 0px 1px 0px 0px #ffffff;-webkit-box-shadow: inset 0px 1px 0px 0px #ffffff;box-shadow: inset 0px 1px 0px 0px #ffffff;background: -webkit-gradient( linear, left top, left bottom, color-stop(0.05, #ededed), color-stop(1, #dfdfdf) );background: -moz-linear-gradient( center top, #ededed 5%, #dfdfdf 100% );filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#ededed', endColorstr='#dfdfdf');background-color: #ededed;-moz-border-radius: 6px;-webkit-border-radius: 6px;border-radius: 6px;border: 1px solid #dcdcdc;display: inline-block;color: #777777;font-family: arial;font-size: 15px;font-weight: bold;padding: 6px 24px;text-decoration: none;text-shadow: 1px 1px 0px #ffffff;cursor: pointer;margin-top: 10px;}
.button: hover{background: -webkit-gradient( linear, left top, left bottom, color-stop(0.05, #ededed), color-stop(1, #cfcfc) );background: -moz-linear-gradient( center top, #ededed 5%, #cfcfcf 100% );filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#ededed', endColorstr='#cfcfcf');background-color: #ededed;border: 1px solid #bbbbbb;}
.button: active{background: -webkit-gradient( linear, left top, left bottom, color-stop(0.05, #dfdfdf), color-stop(1, #ededed) );background: -moz-linear-gradient( center top, #dfdfdf 5%, #ededed 100% );filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#dfdfdf', endColorstr='#ededed');background-color: #dfdfdf;}
#download{margin-top: 50px;width: 400px;height: 100px;font-size: 72px;line-height: 100px;margin-right: 100px;margin-bottom: 50px;text-align: center;}
</style>
<script src="jquery-1.6.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
var obj = $('#sticky');
var offset = obj.offset();
var topOffset = offset.top;
var leftOffset = offset.left;
var marginTop = obj.css("marginTop");
var marginLeft = obj.css("marginLeft");
$(window).scroll(function() {
var scrollTop = $(window).scrollTop();
 if (scrollTop >= topOffset){
  obj.css({
   marginTop: 0,
   marginLeft: leftOffset,
   position: 'fixed',
  });
 }
 if (scrollTop < topOffset){
  obj.css({
   marginTop: marginTop,
   marginLeft: marginLeft,
   position: 'relative',
  });
 }
});
});
</script>
</head>
<body>
<div id="sticky">
 <div id="carbonads-container">
   <div class="carbonad">
    <div id="azcarbon"></div>
     <img src="http://www.jb51.net/images/logo.gif"/>
    </div>
   </div>
  </div>
<div id="text">
<div class="header">d<span class="italic">w</span></div>
<h1>Tutorial: Creating A Sticky Sidebar Using jQuery</h1>
<p>DesignWoop welcomes this guest post by <a href="#">Alexandre Smirnov</a> a web designer and developer who lives and works in Cal-i-for-nia.</p>
<h2><strong>Read the tutorial:</strong> <a href="#">Creating A Sticky Sidebar Using jQuery</a></h2>
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</body>
</html>
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I hope this article will be helpful to everyone’s jquery programming design.