npm installation and uninstall module

npm is a package management tool installed with NodeJS, which can solve many problems in NodeJS code deployment

① npm installation module:

Use npm to install the xxx module to the directory where the current command line is located;

npm install xxx

Use npm to install the global module xxx;

npm install -g xxx

② Use npm to delete the xxx module;

Delete the xxx module;

npm uninstall xxx

Delete the global module xxx;

npm uninstall -g xxx