node.jsNot a language, not a library, not a framework, just a javeScript runtime environment
Simply node.js It can parse and execute javeScript code. In the past, only browsers could parse and execute JaveScript code.
Now javeScript can be run completely without the browser. All thanks to node.js and
nodejs Built on Chrome's V8 engine [currently the fastest to parse and execute JavaScript]: the code is just a string with a specific format, and the engine can parse and run the code
javeScript in node.js
There is no Bom, Dom
In the javeScript execution environment of node, it provides some basic server operations for javeScript: such as file reading and writing, and the construction of network
services , network communication, http server and other processing
node.js features: event-driven, non-blocking IO model [asynchronous], and lightweight and efficient
Use the package manager npm, npm is the world The largest open source library ecosystem on the Internet, most JaceScript related packages are stored on npm
What is vue.js
vue.js is the most popular Front-end framework, React is the most popular front-end framework [React is used for developing websites and mobile apps. Vue can use wee to develop mobile apps]
vue.js is a framework for building user interfaces. It only focuses on the view layer. Vue has supporting third-party class libraries that can be integrated for the development of large projects
The front-end is responsible for the V [front-end page] layer in MVC
Vue.js is one of the mainstream frameworks of the front-end. Together with Angular.js and React.js, it has become the three mainstream front-end frame!
Why vue.js is needed
The development history of improving development efficiency: native JS -> Class libraries such as Jquery-> Front-end template engine-> Angular.js / Vue.js (can help us reduce unnecessary DOM operations; improve rendering efficiency; the concept of two-way data binding [through the instructions provided by the framework, our front-end programmers only need to care about the business logic of the data, no longer care How DOM is rendered])
In Vue, a core concept is to allow users to no longer operate DOM elements, freeing up users’ hands and allowing programmers to spend more time focusing on business logic.
Related learning recommendations: js video tutorial
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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.


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