nodejs basic knowledge

What is nodejs?

node.js is a platform based on the Chrome javaScript runtime, which is used to easily build network applications with fast response speed and easy expansion. (But nodejs is not a javascript application, nodejs is written in c++ language)

js is a scripting language, and scripting languages ​​require a parser to run. For JS written in HTML pages, the browser acts as a parser. For JS that needs to run independently, nodejs is a parser.

Each parser is a running environment that can do the following things:

1. Allow JS to define various data structures and perform operations;

2. Allow JS uses built-in objects and methods provided by the runtime environment.

Example: The purpose of JS running in the browser is to operate the DOM, and the browser provides built-in objects such as document.

The purpose of JS running in nodejs is to operate disk files or build HTT servers. Nodejs accordingly provides built-in objects such as fs and http.

nodejs features:

1. It is a JavaScript running environment

2. Relies on the Chrome V8 engine for code interpretation

3. Event-driven

4. Asynchronous I/O (non-blocking I/O)

5. Events and callbacks (lightweight, scalable, suitable for real-time data interaction applications)

6 .Single process single thread

7.Cross-platform

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