Basic nodejs knowledge, basic nodejs tutorial

Basic nodejs knowledge, basic nodejs tutorial

What is nodejs?

Node. js is a platform based on Chrome javaScript runtime. It is used to conveniently build fast and scalable network applications. (Nodejs is not a javascript application, and nodejs is written in c ++)

Javascript is a scripting language, which requires a parser to run. For JavaScript code written on an HTML page, the browser acts as a parser. Nodejs is a parser for JS that needs to run independently.

Each parser is a running environment and can do the following:

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

2. Allows JS to use the built-in objects and methods provided by the runtime environment.

Example:Javascript running in a browser is used to operate DOM. the browser provides built-in objects such as document.

JS running in nodejs is used to operate disk files or build an HTT server. nodejs provides built-in objects such as fs and http.

Nodejs features:

1. It is a JavaScript Runtime Environment

2. Code explanation based on Chrome V8 engine

3. event-driven

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

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

6. Single process, single thread

7. cross-platform

Http://www.bkjia.com/article/104455.htm (detailed explanation of nodejs features)

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