Download, install and use NVM of node, and related use of node and NRM

This article mainly introduces the relationship between these three , And their respective applications .

Attach the address as usual ：

• node Chinese net
• node Download address of historical version
• nvm Download address （Github）
• nrm

  
  

node

  node, It mainly uses one npm Package management tools , It's also useful node Write background applications , This article mainly introduces node Of npm;
   About what is npm Package management tools , I believe nothing is more authoritative than official documents , So about npm What's your introduction , Please check by yourself node Of npm Official documents

well , Get into the subject .

   About node Installation , I believe most of them have no problem , It's all goofy installation （ Just click on the next step all the way ）

   It is worth noting that ：

   We're entering node When downloading the address , The choice is this Long term maintenance version , Don't choose the latest version , The long-term maintenance version is relatively stable , It is also recommended by the government to choose the long-term maintenance version ;
   Download normally node After installing the package , Direct installation . I won't say much here .

  
  

nrm

installed node, after window + r Input cmd

   Get into ‘ Black window ’ Enter the command ：node --version View installed node edition

See the displayed version number , Express node Installation successful ;

   So what is nrm？

  nrm It's a npm Network speed management tool , because npm By default, all downloads are through foreign websites , So we need to install another nrm Network speed management tool to switch the image source to improve our npm Download speed ：

npm i nrm -g

   Test for successful installation , Enter the following command on the command line to verify the version number , If the version number appears, the installation is successful ：

nrm --version

   Then use nrm Check which image source has a faster network speed （ It will take a while to test ）, Enter the following command at the command line ：

nrm test

   After a while, the command line displays ：

   In front of you * Represents the image source you are currently using ;

   explain ：taobao Our servers are in China , Therefore, it is faster to download and use the image source , Here I have switched ;
  
   How to switch the image source ：

nrm use  Name of the image source 
//  Example 
nrm use taobao

   in addition , You can also use cnpm Download tools to download , Function and npm It's the same ;

//  Global installation  cnpm 
npm install cnpm -g

   Whether to use cnpm Installation tools ,IT Opinions vary in the world , I won't say much here .

  
  

nvm

   I don't know if you found out after joining the company , Used in previous projects of the company node Version and existing node The versions are quite different , It may lead to the use of a new version node Unable to start and run the old project of the packaging company normally ;

   that ,nvm coming , What is? nvm？nvm（node version management） node version management , seeing the name of a thing one thinks of its function ,nvm It's actually a management node Version of a tool , With this tool , We can install multiple node edition , You can switch the desired one according to different items at will node edition ;

nvm Download address （Github）

   After entering the website of the download address , One thing to note is not to use the latest version ：

  
   To download the maintenance version ：
  

  
   After decompression, click the installation package to install ：
  

  
   This is nvm Installation path for ;
  

  
   This is nvm Corresponding node route , Note here that if you installed node, Also hope that before node Version for this nvm Words of management , This node The path needs to be the same as the previous node The path is the same ;
  

  
   Click Next here , If it was installed before node , Will prompt ： Detected that node xx.xx.xx, you hope nvm Control this version ？
  

  
   Click is , Then the normal installation succeeds ：
  

  
   testing nvm Is the installation successful ：
  

  
   Next , adopt nvm Install different versions of node：
  

nvm install 16.15.1

  
   Install one more ：

nvm install 14.4.0

  
   View installed node list

nvm list 
//  perhaps 
nvm ls

  
   Then switch to normal use node Just use version ,

nvm use 14.4.0

  
   And then use npm command , It turned out that the report was wrong ：npm Not an internal command ……

  
   That's because the top passes nvm install node 14.4.0 At version time Installed npm Wrong report ！！！

  
   Check it out. nvm Path folder ：

  
    
   Results found ,node 16.15.1 There are npm command ,node 14.4.0 Of them, there is no ：

• Solution 1 ：
     direct nvm Download the file again node Version can ;

• Solution 2 ：
     Go to npm Mirror website Download the corresponding version , Unzip to node_modules And changed his name to npm, Go to this folder , take bin In the folder npm、npm.cmd、npx、npx.cmd Copy the four files to the corresponding node Version folder ;
     I do not know! node The version corresponds to npm How many versions can you check ：node Previous versions
  
    
     After that , It is suggested that nvm Of the installation path of settings.txt Add to file ： This step is mainly to npm Change the image to Taobao's image , Can increase the download speed . It can also be done through nvm Command to set these addresses , At the end of the article, there is an introduction to the relevant commands , There will be no demonstration here .

node_mirror: https://npm.taobao.org/mirrors/node/ 
npm_mirror: https://npm.taobao.org/mirrors/npm/

Prepare it later nvm Common commands ：

• nvm list ： View the installed node edition
• nvm ls ： List all node edition
• nvm version ： View the current nvm edition
• nvm install <version> ： Install the specified node edition
• nvm use <version> ： Switch to use the specified node edition
• nvm uninstall <version> ： Uninstall the specified node edition
• nvm current ： Displays the current node edition
• nvm alias <name> <version> ： To different node Add an alias to the version number
• nvm unalias <name> ： Delete the defined alias
• nvm on ： open nodejs control
• nvm off ： close nodejs control
• nvm proxy ： View settings and agents
• nvm node_mirror [url] ： Set or view setting.txt Medium node_mirror, If not set, the default is https://nodejs.org/dist/
• nvm npm_mirror [url] ： Set or view setting.txt Medium npm_mirror, If not set, the default is ： https://github.com/npm/npm/archive/.
• nvm use [version] [arch] ： Switch the settings node Version and number of digits
• nvm root [path] ： Set up and view root route