The differences and connections between jQuery, AJAX and JavaScript
JQuery and AJAX are both frameworks of Javascript, each with its own different functions. If Javascript is compared to a father, JQuery and AJAX are the biological sons of Javascript. Very complex functions in Javascript are extremely convenient and quick to implement. Let's summarize their respective functions, characteristics and application occasions.
JQuery is a lightweight js library that is compatible with CSS3 and various browsers (IE 6.0+, FF1.5+, Safari 2.0+, Opera 9.0+). jQuery enables users to more easily process HTML documents and events, implement animation effects, and easily provide AJAX interaction for websites. jQuery also has many mature plug-ins to choose from. jQuery can keep the code and html content of the user's html page separated. In other words, there is no need to insert a bunch of js in the html to call the command. You only need to define the id.
The purpose of JQuery is - WRITE LESS, DO MORE, which means "eat less, do more". Let our programmers write less code and do more things.
And when is JQuery used? Similar to what was said above, its main uses are:
1. The selector
can quickly and accurately locate the specified element through the $ symbol. Selectors include: basic selector, hierarchical selector, filter selector, form selector
2. DOM operations
Find DOM elements through the $ symbol, operate on attributes; add and delete nodes; operate on styles; set Get HTML text and value; traverse child elements or sibling elements; add events
3. Form validation
4. Animation effects
5. ajax
The above summary is JQuery, and let’s continue to summarize AJAX.
AJAX stands for "Asynchronous JavaScript and XML". The so-called asynchronous means that the browser can still do other things after the event is triggered, and controls unrelated to the control where the event occurred are not affected. AJAX is a technology used to create better, faster, and more interactive web applications.
If you only learn to use a few AJAX controls in .net, you may not understand what Javascript and XML in AJAX are all about. These controls are their encapsulation. Microsoft has made it a lot more convenient for us, but This is a "fool-proof" way to use it. If you want to deeply understand the use of Javascript and XML, you also need to master how the client accepts Webservice (.asmx) and WCF (.svc) and how to use general processing program (.ashx) files
When will that happen? Using AJAX, when is it more appropriate to use AJAX? It is generally used where local changes occur on the page. As follows:
1. Form-based interaction
2. Deep tree navigation
3. Real-time user-to-user communication
4. Voting, choice, rating
5. Filtering and complex data manipulation
6 . 普通录入时的提示/自动补齐
不适用使用AJAX的场合:
1. 简单的表单
2. 搜索
3. 基本导航
4. 替换大量的信息
5 . Display operation
6. Uncontinent web pages

Node.js excels at efficient I/O, largely thanks to streams. Streams process data incrementally, avoiding memory overload—ideal for large files, network tasks, and real-time applications. Combining streams with TypeScript's type safety creates a powe

The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

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.


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