This is the 11th day of my participation in the August More Text Challenge. For details, see:August is more challenging

preface

What is NPM?

NPM is a package management tool for JavaScript

NPM opens the door for you and your team to connect the entire world of JavaScript geniuses. It is the largest software registry in the world, with about 3 billion downloads per week and more than 600,000 packages (that is, code modules). Open source software developers from all continents use NPM to share and learn from each other. The structure of the package enables you to easily track dependencies and versions.

NPM Common commands

View the NPM version

npm -v
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Upgrade the global NPM

sudo npm install npm -g
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If the system is Windows, run the following command:

npm install npm -g
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NPM help

npm  help
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NPM Clears the cache

npm cache clear
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The module

Install the module

NPM insatll express NPM install // Install all modules in current package.jsonCopy the code

Uninstall the module

npm uninstall express
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View the current NPM /node_modules/ package list

npm ls
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Search module

npm search express
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The update module

npm update express
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NPM address configuration

  • The original address of NPM

npm config set registry http://registry.npmjs.org
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  • Setting the domestic Image

A. Run the config command

NPM config set registry https://registry.npm.taobao.org NPM info the underscore (if there could be strings configured properly this command response)Copy the code

B. Specify on the command line

npm --registry https://registry.npm.taobao.org info underscore
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C. Edit ~/.npmrc to add the following content

registry = https://registry.npm.taobao.org
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  • Use NRM to manage the Registry address

A. download the NRM

npm install -g nrm
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B. Add the Registry address

nrm add npm http://registry.npmjs.org

nrm add taobao https://registry.npm.taobao.org
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C. Switch the NPM Registry address

nrm use taobao

nrm use npm
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other

Viewing basic Configurations

NPM config list NPM config list -l // View all configurationsCopy the code

What is the difference between a NPM local installation and a global installation?

NPM install grunt // Download the module to the directory where the current command line is located. NPM install -g grunt// The module will be downloaded and installed in the [global] directory;Copy the code

NPM How do I obtain the default directory for global installation?

NPM config get prefix NPM How do I set the default directory for global installation? NPM config set prefix "directory"Copy the code

NPM release undo

Release NPM package

npm publish
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Revocation of NPM package

npm unpublish
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The version number

Version numbers are accessed when you download and distribute code using NPM. NPM uses semantic version numbers to manage code, which are briefly introduced here.

The semantic version number consists of X.Y.Z, which represents the major version number, minor version number, and patch version number. When code changes, the version number is updated as follows.

  • If you’re just fixing a bug, you need to update the Z bit.
  • If the new function is backward compatible, you need to update the Y bit.
  • If there is a big change, downward incompatibility, need to update the X bit.

With this guarantee in place, when declaring third-party package dependencies, you can rely not only on a fixed version number but also on a range of version numbers. For example, “argv”: “0.0.x” means relying on the latest version of the 0.0.x series argV.

You can view the official document to specify all version ranges supported by NPM.