NPM installation yarn

npm and yarn The difference between ：

1、 Speed difference

npm Execute each task according to the queue package, That is to say, we have to wait until now package After installation , In order to continue with the later installation ;

Yarn Synchronize all tasks , Improved performance .

2、 Installation version difference

Yarn By default, a lock file like this is generated

npm To pass the shrinkwrap Command to generate npm-shrinkwrap.json file , Only when this file exists ,packages The version and information will be recorded .npm5.0 After that, similar yarn.lock Of package-lock.json.

3、 Content output is different

npm The output information of is rather lengthy . In execution npm install When , The command line will continuously print out all installed dependencies .

Yarn Too much simplicity ： By default , Combined with the emoji Print out the necessary information intuitively and directly , It also provides commands for developers to query additional installation information .

install yarn technological process

1、 install node.js（ skip ）;

2、 Execute the installation instructions ：

npm install -g yarn --registry=https://registry.npm.taobao.org

3、 To configure yarn Source , Change to the source of Taobao ：

yarn config set registry https://registry.npm.taobao.org -g

yarn config set sass_binary_site http://cdn.npm.taobao.org/dist/node-sass -g

Be careful ： When performing step 3 , If you are prompted ‘yarn’ When not an internal or external command , Check to see if yarn The installation package path is added to the system Path In the path .