


js implements the code of the floating ad bar that can be closed at the top of the website
This article mainly introduces the js implementation of the floating ad bar code that can be closed at the top of the website, involving the implementation techniques of javascript based on mouse events to operate page element styles. Friends in need can refer to the following
This article explains the examples Use js to realize the closing floating advertising banner at the top of the website. Share it with everyone for your reference. The details are as follows:
This is an advertising banner code that usually floats at the top of the website and can be closed. The design is beautiful and simple, with a close button, adaptive to the width of the web page, and clear colors. I believe many friends will like it. .
The screenshot of the running effect is as follows:
The online demo address is as follows:
http://demo.jb51. net/js/2015/js-top-float-clase-able-adv-codes/
The specific code is as follows:
<html> <head> <title>网站页首可关闭广告条</title> <style type="text/css"> <!-- body { margin: 0px;padding: 0px;text-align: center;} TD {FONT-SIZE: 12px; COLOR: #333;} #topadv {BORDER-BOTTOM: #e2e2e2 1px solid;} --> </style> </head> <body> <SCRIPT> function floatadv(){ document.getElementById("topadv").style.display="none"; } </SCRIPT> <p id=topadv> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="4%" height="30" align="center"><img src="/static/imghwm/default1.png" data-src="images/kids.gif" class="lazy" style="max-width:90%" style="max-width:90%" alt="js implements the code of the floating ad bar that can be closed at the top of the website" ></td> <td width="82%"><a href="//www.jb51.net/">脚本之家</a>是国内专业的网站建设资源、脚本编程学习类网站,提供asp、php、asp.net、javascript、jquery、vbscript、dos批处理、网页制作、网络编程、网站建设等编程资料。</td> <td width="14%" align="right"><a style="CURSOR: hand" onClick=floatadv()><img src="/static/imghwm/default1.png" data-src="images/close.gif" class="lazy" style="max-width:90%"6" border=0></a></td> </tr> </table> </p> </body> </html>
The above is the entire content of this chapter, more For more related tutorials, please visit JavaScript Video Tutorial!

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.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.


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