


jQuery implements a complete example of imitating the two-level navigation menu effect of Meicheng Internet_jquery
The example in this article describes the jQuery implementation of the two-level navigation menu effect imitating Meicheng Internet. Share it with everyone for your reference. The details are as follows:
This is a two-level navigation menu based on jQuery that imitates Meicheng Internet. It works well, it is more like a sliding door and will not let you down.
Let’s take a look at the screenshots of the running effect:
The online demo address is as follows:
http://demo.jb51.net/js/2015/jquery-f-mchl-2l-nav-menu-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=gb2312" /> <title>仿美橙互联导航菜单</title> <style> body { margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; } a:link { text-decoration: none; } a:visited { text-decoration: none; } a:hover { text-decoration: none; } a:active { text-decoration: none; } #nav_wrap{margin:20px auto;} #nav li{ text-align:center;font-size:12px;} #nav_wrap { width:960px; overflow:hidden; } #nav{ background:url(images/nav_bg.gif) repeat-x; height:39px; position:relative; width:950px; margin:0 auto; } #nav .l{ background:url(images/navnbg.gif) no-repeat 0px 0px; height:39px; width:2px; float:left} #nav .r{ background:url(images/navnbg.gif) no-repeat -4px 0px; height:39px; width:2px; float:right} #nav .bt_qnav { float:right; } #nav .bt_qnav a{ width:31px; height:29px; line-height:39px;display:block;padding:9px 2px 0 0;} #nav .c{ float:left;margin:0;padding:0} #nav li { float:left; list-style:none; } #nav li .v a{ width:83px;height:39px; line-height:33px; display:block; color:#FFF; background:url(images/navnbg.gif) no-repeat -87px 6px; float:left; font-family:"Microsoft Yahei";} #nav li .v a:hover,#nav li .v .sele{background:url(images/navnbg.gif) no-repeat 0px -47px; color:#116406; line-height:42px; font-size:14px} #nav .kind_menu { height:30px;*height:29px; line-height:30px;vertical-align:middle; position:absolute; top:37px;*top:39px; left:70px; width:880px; text-align:left; display:none; background:url(images/nav_bg1.gif) repeat-x bottom; color:#656565; } #nav .kind_menu a {color:#656565; float:left; text-align:center; width:90px; font-family:Arial, Helvetica, sans-serif;} #nav .kind_menu a:hover { color:#ff4300; background:url(images/navnbg.gif) no-repeat 1px -91px;*background:url(images/navnbg.gif) no-repeat 1px -93px;} #nav .kind_menu span { font-size:10px; color:#cecece; line-height:30px; *line-height:26px; float:left } #tmenu{ background:url(images/nav_bg1.gif) repeat-x bottom; height:28px; border-bottom:1px solid #eee; } </style> <SCRIPT src="jquery1.3.2.js" type="text/javascript"></SCRIPT> </head> <body style="text-align:center"> <DIV id=nav_wrap> <DIV id=nav> <DIV class=l></DIV> <UL class=c> <LI><SPAN class=v><A href="#" target="_blank">首页</A></SPAN> <DIV class=kind_menu style="LEFT: 20px">欢迎访问美橙互联! </DIV></LI> <LI><SPAN class=v><A href="#">特惠套餐</A></SPAN> <DIV class=kind_menu style="LEFT: 40px"><A href="#">电信套餐</A> <SPAN>|</SPAN> <A href="#">双线套餐</A> </DIV></LI> <LI><SPAN class=v><A href="#">域名频道</A></SPAN> <DIV class=kind_menu><A href="#">英文域名</A> <SPAN>|</SPAN> <A href="#">中文域名</A> <SPAN>|</SPAN> <A href="#">通用网址</A> <SPAN>|</SPAN> <A href="#">价格列表</A> <SPAN>|</SPAN> <A href="#" target=_blank>域名交易</A> <SPAN>|</SPAN> <A href="#">相关帮助</A> <SPAN>|</SPAN> <A href="#">智能加速</A> </DIV></LI> </UL> <DIV class=r></DIV> </DIV><!--nav--> <DIV id=tmenu></DIV> </DIV><!--nav_wrap--> <SCRIPT type=text/javascript> var site_url = window.location.href.toLowerCase(); switch (true) { default : $("#nav li").attr("class",""); $("#nav li").eq(0).attr("class","nav_lishw"); $(".nav_lishw .v a").attr("class","sele"); $(".nav_lishw .kind_menu").show(); } $("#nav li").hover( function(){ clearTimeout(setTimeout("0")-1); $("#nav .kind_menu").hide(); $("#nav li .v .sele").attr("class","shutAhover"); $(this).attr("id","nav_hover") $("#nav_hover .v a").attr("class","sele"); $("#nav_hover .kind_menu").show(); }, function(){ if($(this).attr("class") != "nav_lishw"){ $("#nav_hover .v .sele").attr("class",""); $("#nav_hover .kind_menu").hide(); } $(this).attr("id","") $("#nav li .v .shutAhover").attr("class","sele"); setTimeout(function(){ $(".nav_lishw .kind_menu").show(); $(".nav_lishw .v a").attr("class","sele"); },50); } ); </SCRIPT> </body> </html>
I hope this article will be helpful to everyone’s jQuery programming.

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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