Let’s put it this way, only with a solid foundation in JavaScript can you use various JS libraries with ease, and then let’s get to the point!
1. Let’s talk about the efficiency of JQuery first
He The speed of the selector is about 4 times slower than the standard JS Dom (officially said, I am not making it up...), so why do we still use it? The reason is very simple, the first JS is For client-side applications, the speed impact is not so obvious, but you must pay attention to when to use JQuery selectors and when to use JavaScript selectors!
This is my personal understanding, if the logic is easier when selecting objects Then don't use JQuery's selector, such as
Then just do simple verification, no complicated operations, just use document.getElementById("name" );
Don’t use JQuery’s $("#ID") just because it looks convenient, but if you want to do more complex and logical operations, use JQuery. For example, there are 10
When we want to delete the rows they are in after checking
$("input[checked]").parent().parent().remove(); This way of writing is in It is better in terms of logic and maintainability!
2. Let’s talk about cross-browser aspects
Generally, when writing JavaScript, there is code. If you want to run on different browsers, some methods The problem is that it is not supported by the browser and must be modified. JQuery has done a better job in this regard and supports mainstream browsers, so that one code can be used on multiple browsers
3. Next, let’s talk about "Zonghai Development"
Nowadays development emphasizes high speed, high quality and easy maintenance. It can be written from scratch using traditional JavaScript, but it will cause problems in the development progress. It has a great impact, and JQuery has a rich plug-in library, which greatly improves development efficiency. You may say that with so many plug-in libraries, just looking at the API is exhausting, but JQuery has done a good job in this regard. Each plug-in has Detailed comments and Domo make it easy to put it into practical applications.
This is my first time writing something. Don’t be angry if I don’t write well. The next article will introduce some techniques for applying JavaScript and JQuery in actual development. ,Thank you

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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