


jQuery implements the data loading effect of imitating the Weibo drop-down scroll bar_jquery
The example in this article describes how jQuery can imitate the data loading effect of the Weibo drop-down scroll bar. Share it with everyone for your reference, the details are as follows:
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>滚动条距离底部</title> <script src="jquery-1.6.2.min.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { var i = 4; $(window).bind("scroll", function (event) { //滚动条到网页头部的 高度,兼容ie,ff,chrome var top = document.documentElement.scrollTop + document.body.scrollTop; //网页的高度 var textheight = $(document).height(); // 网页高度-top-当前窗口高度 if (textheight - top - $(window).height() <= 100) { if (i >= 100) { return; //控制最大只能加载到100 } $('#div1').css("height", $(document).height() + 100); i++; //可以根据实际情况,获取动态数据加载 到 div1中 $('<div>' + i + '</div>').appendTo($('#div1')); } }); }) </script> <style> #div1 div{ font-size:100px; background:#ccc;margin-top:5px} </style> </head> <body> <form id="form1" runat="server"> <div style="height: 1000px;" id="div1"> <div> 1</div> <div> 2</div> <div> 3</div> <div> 4</div> </div> </form> </body> </html>
I hope this article will be helpful to everyone in jQuery programming.

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Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

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JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.


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