Getting started with vue---npm command

1. What is npm

The full name of NPM is Node Package Manager , which is a NodeJS package management and distribution tool , and has become an unofficial standard for releasing Node modules (packages).

Two, npm use 

1. Initialize npm

• npm init 
• 
• npm init -y quick initialization project

2. Catalog Explanation

•  package.json project package management file
• package-lock.json download cache address

• The location where the node_modules installation package is downloaded

3. Install install

(1) Ordinary installation 

        Example: Install jquery npm install jquery

         

(2 ) Global installation

        Example: Install vue globally npm i @vue/cli -g 

         

(3) Install a fixed version  

        Example: Install fixed version 2.1 of jquery npm i [email protected] -S

         

4. Uninstall uninstall

        Example: Uninstall jquery npm uninstall jquery 

          

5. View the location of the global installation of the plug-in 

         npm root view -g

        

6. Version number XYZ

•  X major version, the upgrade of X is incompatible 3.6.0->4.0.1 is not compatible, the project using 3.6.0 is incompatible with the current 4.0.1 project;
•  The version in Y, the upgrade of Y means that there is a new content addition (compatible);
• Z minor releases usually fix bugs.

 7. update update

        Example: update jquery npm update jquery