node. js Brief overview

V8 (Google Chrome's JavaScript engine), node. JS is based on the JavaScript runtime environment on the V8 engine and can be seen as a more abstract JS engine.

node. JS uses an event-driven, non-blocking I/O model. (non-blocking I/O:I/O operations do not block the execution of the program, while the I/O operation continues to execute other code.) Event-driven: Each asynchronous event generates an event watcher that invokes the appropriate callback function if an event occurs, or the request completes.

var fs = require ("FS"); Fs.readfile ("./testfile", "UTF8", function (error, file) {       if (error) throw error;       Console.log ("I finished reading the papers!") ");}); Console.log ("I won't be blocked!" ");

node. JS's package management tool NPM. node. js is installed, and NPM is installed with it.

node. js Brief overview