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
The above is the entire content of this article. I hope that the content of this article can bring some help to everyone's study or work, and I also hope for your support. PHP Chinese website!
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