Setup can not detect version complete yarn
after yarn installation can not detect the version number
is prohibited because the script is running on this system.
Solution:
1, search powershell (power shell) - the right choice - Run as administrator
2, RemoteSigned (remote signature)
to execute the script unsigned signature to ensure the normal operation of the local computer
to perform: set-ExecutionPolicy RemoteSigned
execution: get- ExecutionPolicy can view policy
