node. JS module and NPM Package management tool

in the in Nodejs, a module divides all functions into units and provides a complete module loading mechanism.

module in Nodejs is a very important concept that allows us to introduce third-party class libraries into our applications.

in the in Nodejs you can write or introduce several module files:

1) js script file with suffix . js.

2) A JSON text file with the suffix . json.

3) a compiled binary module file with the suffix. node.

There are two ways to access members within a module outside the module:

1. use The exports object to expose the object. For example:exports.msg=msg; the msg was exposed.

2 . Define the module as a class. For example:module.exports=foo;foo is the exposed class.

Require ("Index.js"); The file is loaded from the Node_modules directory by default .

Properties of the Module object:

Module.id: ID of the current module .

Module.filename: The file name of the current module file.

Module.loaded: boolean value. false indicates that the module is not loaded and True indicates that the module has finished loading.

Module.parent: The parent Module object of the current module.

Module.children: The property value is an array that holds all the submodule objects of the current module, that is, all the module objects that have been loaded in the module.

Note: Nodejs Official Package Warehouse website:http://registry.npmjs.org

This article is from "Time" blog, please make sure to keep this source http://timeblog.blog.51cto.com/8650972/1588755

node. JS module and NPM Package management tool