Without further ado, I will just post the jquery code for you. The specific code is as follows:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" href="css/index.css"> <script src="js/jquery-1.11.3.js"></script> <script src="js/baner.js"></script> </head> <body> <div class="main"> <a href=""><img src="/static/imghwm/default1.png" data-src="img/baner-1.jpg" class="lazy" alt=""></a> <a href=""><img src="/static/imghwm/default1.png" data-src="img/baner-2.jpg" class="lazy" alt=""></a> <a href=""><img src="/static/imghwm/default1.png" data-src="img/baner-3.jpg" class="lazy" alt=""></a> <a href=""><img src="/static/imghwm/default1.png" data-src="img/baner-4.jpg" class="lazy" alt=""></a> <ul> <li>1</li> <li>2</li> <li>3</li> <li>4</li> </ul> </div> </body> </html> /*************初始化************/ *{margin:0;padding: 0;border: none;list-style: none} /*********轮播左右居中*************/ .main{ width: 1024px; height: 320px; margin: 0 auto; position: relative; } .main a{ position: absolute; } .main a img{ width: 100%; height: 320px; } /***********左边小图标************/ .main ul li.selected{ background: #f97157; } .main ul{ position: absolute; z-index: 999; top: 120px; left: 20px; } .main ul li{ width: 20px; height: 20px; border-radius: 50%; background: #909090; cursor: pointer; text-align: center; } /** * Created by Administrator on 16-3-12. */ /***********定义全局变量和定时器*************/ var t=null; var n=0;/**动态变化**/ var count; /************************/ $(function(){ count=$(".main a").length;/*给动态变化的n备用*/ /**让不是轮播中的第一个隐藏**/ $(".main a:not(:first-child)").hide(); /*点击当前li当前li对应的图片显示出来*/ $(".main ul li").click(function(){ var index=$(this).text()-1; n=index; console.log(n); /*****让当前显示的图片0.5S内渐隐,并匹配下一个渐显示*****/ $(".main a").filter(":visible").fadeOut(500).parent().children().eq(index).fadeIn(1000); /*******聚焦,给当前li追加类,改变背景色*******/ $(this).addClass("selected"); /****同时移除当前li的所有兄弟的类名为selected,还原背景色*****/ $(this).siblings().removeClass("selected"); }); /***定义定时器3秒执行一次****/ t=setInterval("autoMove()",3000); /****当鼠标进入时候定时器停止,移除时候定时器开启****/ $(".main").hover(function(){clearInterval(t)}, function(){t = setInterval("autoMove()", 3000);}); }); /***定义自动轮播函数****/ function autoMove(){ if(n>=(count-1)){ n=0; }else{ ++n; } /*****给li执行匹配的事件*****/ $(".main ul li").eq(n).trigger("click"); }
The above is the simple carousel effect implemented by Jquery introduced by the editor. I hope it will be helpful to everyone!

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.


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