Web Front-endJS TutorialJS realizes the layer effect code that scrolls with the scroll bar on the web page_javascript skillsJS realizes the layer effect code that scrolls with the scroll bar on the web page_javascript skills
The example in this article describes the JS implementation of the layer effect code that scrolls with the scroll bar on the web page. Share it with everyone for your reference, the details are as follows:
The scrolling layer code on this webpage follows the scroll bar. Drag the scroll bar to see the effect. The code for the couplet advertisement is also based on this. The floating layer on the right can also be closed with a little processing. Implement the code for a floating ad, run it and see the effect first.
The screenshot of the running effect is as follows:
The online demo address is as follows:
http://demo.jb51.net/js/2015/js-web-fixed-scroll-adv-codes/
The specific code is as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>随滚动条滚动的层</title>
<style>
body{ margin:0; padding:0; font-size:12px; font-family:"宋体",Arial, Helvetica, sans-serif;}
div,p,ul,ol,li,dl,dt,dd,h1,h2,h3,h4,h5,h6,form,input,form{ margin:0; padding:0;}
h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;}
img{ border:0;}
ol,ul{list-style:none;}
a{ text-decoration:none; color:#fff;}
a:hover{ text-decoration:none;}
#scroll_div{ width:100px; height:400px; background:#990; }
#btn_close,#btn_gotop{ cursor:pointer;}
</style>
</head>
<body>
<div style=" width:1002px;height:42px;margin:0 auto; background-color:#060;">头</div>
<div style="width:1002px; margin:0 auto; background-color:#f60;">
我们提供各类编程源码、<br>素材、书籍教程、设计模板、<br>网页特效代码以及常用软件下载等，<br>做有质量的<br>学习型源码下载站。
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</div>
<div style=" width:1002px;height:95px;margin:0 auto; background-color:#060;">底</div>
<div id="scroll_div">
<span id="btn_close">关闭</span><br />
<span id="btn_gotop">返回顶部</span>
</div>
<script type="text/javascript">
var Bianyuan = {
//添加事件2(DOM-保证this指向对象是obj)
addEvent : function(obj, type, fn){
if (obj.attachEvent){
obj['e'+type+fn] = fn;
obj[type+fn] = function(){obj['e'+type+fn](window.event);}
obj.attachEvent('on'+type, obj[type+fn]);
}else{
obj.addEventListener(type, fn, false);
}
},
//获取id元素
$ : function(id){
return document.getElementById(id);
},
//取得浏览器可视区size
getBrowserSize : function(){
var pageWidth = window.innerWidth,
pageHeight = window.innerHeight;
if (typeof pageWidth != "number"){
if (document.compatMode == "CSS1Compat"){
pageWidth = document.documentElement.clientWidth;
pageHeight = document.documentElement.clientHeight;
} else{
pageWidth = document.body.clientWidth;
pageWidth = document.body.clientHeight;
}
}
//ie减去17滚动条宽度
if(!window.ActiveXObject){
pageWidth -= 17;
}
return {
width : pageWidth,
height : pageHeight
}
},
//获取滚动条高度
getPageScroll : function(){
var yScroll;
if (self.pageYOffset) {
yScroll = self.pageYOffset;
} else if (document.documentElement && document.documentElement.scrollTop){
yScroll = document.documentElement.scrollTop;
} else if (document.body) {
yScroll = document.body.scrollTop;
}
return yScroll;
}
}
function scrollBar(scrollId, dir, headHeight, footHeight, areaWidth, o){
//滚动框宽高
var scrollBar = Bianyuan.$(scrollId),
barWidth = scrollBar.offsetWidth,
barHeight = scrollBar.offsetHeight;
//可视区宽高
var pageWidth = Bianyuan.getBrowserSize().width,
pageHeight = Bianyuan.getBrowserSize().height;
//内容宽高
var widthMore = document.documentElement.scrollWidth,
heightMore = document.body.scrollHeight||(document.documentElement.scrollHeight);
//最大宽高
var maxWidth = Math.max(pageWidth, widthMore),
maxHeight = Math.max(pageHeight, heightMore);
scrollBar.style.position = 'absolute';
//设置top--假设滚动框高度小于整个页面高度，如果大于直接将其隐藏
if (maxHeight < (barHeight + footHeight + footHeight + 4)){
scrollBar.style.display = 'none';
}else{
//不挡顶部---如果想改距顶高度，改下边的第一个2值
scrollBar.style.top = Bianyuan.getPageScroll() + headHeight + 2 + 'px';
//不挡底部
if ((heightMore - Bianyuan.getPageScroll() - barHeight) <= footHeight){
scrollBar.style.top = heightMore - footHeight - barHeight - 2 + 'px';
}
}
//无视主体内容-左右
if (dir == 'left' && areaWidth == 1){
scrollBar.style.left = 2 + 'px';
}else if (dir == 'right' && areaWidth == 1){
scrollBar.style.left = maxWidth - barWidth - 2 + 'px';
//根据主体内容宽-左右
}else if (dir == 'left' && areaWidth != 1){
if (pageWidth >= (barWidth*2 + areaWidth + 4)){
scrollBar.style.left = (pageWidth - areaWidth)/2 - barWidth - 2 + 'px';
}else{
scrollBar.style.left = 2 + 'px';
}
}else if (dir == 'right' && areaWidth != 1){
if (pageWidth >= (barWidth*2 + areaWidth + 4)){
scrollBar.style.left = (pageWidth - areaWidth)/2 + areaWidth + 2 + 'px';
}else{
scrollBar.style.left = maxWidth - barWidth - 2 + 'px';
}
}
//关闭和返回顶部
if (o){
if (o.btnClose){
var closeBtn = Bianyuan.$(o.btnClose);
Bianyuan.addEvent(closeBtn, 'click', function(){
scrollBar.style.display = 'none';
})
}
if (o.goTop){
var gotopBtn = Bianyuan.$(o.goTop);
Bianyuan.addEvent(gotopBtn, 'click', function(){
document.documentElement.scrollTop = 0;
document.body.scrollTop = 0;
})
}
}
//改变窗口大小或滚动条滚动
resizeWindow(scrollId, dir, headHeight, footHeight, areaWidth, o);
}
function resizeWindow(scrollId, dir, headHeight, footHeight, areaWidth, o){
window.onresize = function(){scrollBar(scrollId, dir, headHeight, footHeight, areaWidth, o);}
window.onscroll = function(){scrollBar(scrollId, dir, headHeight, footHeight, areaWidth, o);}
}
</script>
<script type="text/javascript">
scrollBar("scroll_div", "right", 42, 95, 1002, {btnClose:"btn_close",goTop:"btn_gotop"});
</script>
</body>
</html>
I hope this article will be helpful to everyone in JavaScript programming.
Python vs. JavaScript: A Comparative Analysis for DevelopersMay 09, 2025 am 12:22 AMThe main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.
Python vs. JavaScript: Choosing the Right Tool for the JobMay 08, 2025 am 12:10 AMWhether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.
Python and JavaScript: Understanding the Strengths of EachMay 06, 2025 am 12:15 AMPython and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.
JavaScript's Core: Is It Built on C or C ?May 05, 2025 am 12:07 AMJavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.
JavaScript Applications: From Front-End to Back-EndMay 04, 2025 am 12:12 AMJavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.
Python vs. JavaScript: Which Language Should You Learn?May 03, 2025 am 12:10 AMChoosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.
JavaScript Frameworks: Powering Modern Web DevelopmentMay 02, 2025 am 12:04 AMThe power of the JavaScript framework lies in simplifying development, improving user experience and application performance. When choosing a framework, consider: 1. Project size and complexity, 2. Team experience, 3. Ecosystem and community support.
The Relationship Between JavaScript, C , and BrowsersMay 01, 2025 am 12:06 AMIntroduction I know you may find it strange, what exactly does JavaScript, C and browser have to do? They seem to be unrelated, but in fact, they play a very important role in modern web development. Today we will discuss the close connection between these three. Through this article, you will learn how JavaScript runs in the browser, the role of C in the browser engine, and how they work together to drive rendering and interaction of web pages. We all know the relationship between JavaScript and browser. JavaScript is the core language of front-end development. It runs directly in the browser, making web pages vivid and interesting. Have you ever wondered why JavaScr
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
Dreamweaver Mac version
Visual web development tools
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
SublimeText3 Mac version
God-level code editing software (SublimeText3)
