The difference between -s and -d when downloading packages using NPM

npm install name -save-dve Abbreviation （npm install name -D） Automatically add the module and version number to devdependencies.

npm install name -save Abbreviation （npm install name -S） Automatically add the module and version number to dependencies.

-D after , The installation package will package Medium devDependencies In the object . abbreviation dev.dev It is used in the development environment .

give an example ：

Building tools ：gulp and webpack It is used to compress code , Tools needed for packaging , When the program actually runs, it doesn't need , It's going to be put in dev So use -D

-S after , The installation package will package Medium dependencies In the object . abbreviation dep.dep It is used in the production environment .

give an example ：

Project plug-in ： for example element ui、echarts This plug-in To be used in operation , It's going to be put in dep So I use -S

Generally, our project plug-ins , stay api You can see , It's usually -S. Because these plug-ins are used during program operation .