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Automatically install the specified version of the package , Except for the specified version number , Other version numbers are automatically the latest .

Version number includes ： The major version number . Sub version number . Patch number

package.json in ^ It refers to locking the major version number ,～ It refers to locking the major version number and minor version number , Empty finger locks the entire version number ,* Refer to the latest version .

install git The package released on

# This is suitable for the installation of... Within the company git The project on the server
npm install git+https://[email protected]:lurongtao/gp-project.git

# Or with ssh The way
npm install git+ssh://[email protected]:lurongtao/gp-project.git

The red box in the following figure is through git Installation of the package

npm ci

according to package-lock.json（npm i Post generated files , Used to lock versions and record dependencies ） File installation depends on . comparison npm i Speed increased significantly . Also support --production Parameters .

Be careful （ contrast npm i）

npm ci Cannot be used to install a single dependency , Can only be used to install dependencies for the entire project
npm ci Will detect if node_modules Already exist , Delete first and then install
Will not update package.json or package-lock.json file , The whole installation process is locked .
package-lock.json 、npm-shrinkwrap.json If the file does not exist, an error will be reported
lock And package.json The version in does not match ,npm ci Direct error reporting interrupt , Instead of updating lock file .

Recommended ：npm ci --cache .npm --quiet --no-progress close log And progress , It can speed up the download .

npm outdated

Show package.json The other version bits under the locked version bit in are not the latest packages .

npm update

take package.json Other version bits under the locked version bit of the package become the latest .

npm init -y

Generate package.json Module profile .

At this point through npm run dev The command is equivalent to entering ./node_modules/.bin/gulp -v.

Note that the red box below can be removed , function npm run dev Command will automatically go to the global to find the corresponding file , If not, you will go to the current path node_modules Search for .

stay scripts The script written on , The environment to run from the command line is node Environment .

npm list

Check the versions of all installation packages and dependent installation packages .

npm list ｜ grep packageName

View the version of the specified installation package and the dependent installation package

npm install --production

Install only package.json Production environment package in .

npm view packagename versions

View all versions of the specified package

npm cache clean --force

eliminate npm cache （ Use when you can't download after downloading errors ）

npm config get registry

Get the remote warehouse Path .

npm config set registry https://registry.npm.taobao.org

Set the remote warehouse address to Taobao image path , The default remote warehouse address is http://registry.npmjs.org.

module.exports = Variable name

You can also directly exports Mount variables on ,exports by module.exports References on （ You can't give it directly to exports assignment ）

require('./ route ') You cannot write the beginning of the file name directly , What is introduced is export References to .

npm install express-generator -g Command to install

express -h Option to list all available command line options

express -e Directly generate the server-side project

Upload your own package

land npm Official website , Password of registered account , Execute the following command . Note that the uploaded package should have packgage.json file .package.json in name For the uploaded package name ,version Version number ,description by readme Described in the .

npm adduser

Landing user . Note that the remote image warehouse should be http://registry.npmjs.org. If not, you need to reset the original address and log in again .

npm publish

Upload your own package .

yarn

Package management and distribution tools . Only partial and npm The command line has different commands .

Chinese official website

install

install | Yarn Chinese document

Command line

CLI Introduction | Yarn

yarn add [email protected] Version number

Install dependency packages .

--dev(-D)： Development environment dependency , Used to write package.json Development environment file .
--peer(-P)： Equally dependent on , Or peer dependence （ When multiple packages depend on 1 A bag , Use when you need to unify the version of this package ）.
--optional(-O)： Optional dependency , If there are some dependent packages, even if the installation fails , Install alternate packages to keep the project running . You can use optionalDependencies. Be careful packageName in optionalDependencies Will be covered dependencies Dependency package with the same name in , So don't write in both places .