Yarn: unable to load file d:\programfiles\nodejs\yarn PS1, because running scripts is prohibited on this system

error message

yarn : Unable to load file D:\ProgramFiles\nodejs\yarn.ps1, Because scripts are not allowed to run on this system . For more information , see also https:/go.microsoft.com/fwlink/?LinkID=135170 
Medium about_Execution_Policies.
The position of That's ok :1 character : 1
+ yarn run serve
+ ~~~~
    + CategoryInfo          : SecurityError: (:) [],PSSecurityException
    + FullyQualifiedErrorId : UnauthorizedAccess
Terminal process “C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -Command yarn run serve” Terminated , Exit code : 1. 

The main reason is powershell The execution policy of prevented this operation

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solve

stay powershell Command line

windows Run under *.ps1 Script （powershell Script for ） When , You need to set execution permissions 

 Carry out orders : set-ExecutionPolicy RemoteSigned # Remote signature 
#Set-ExecutionPolicy Restricted # No execution is allowed ( The default option )
#Set-ExecutionPolicy Unrestricted # unlimited 
# Parameters  -Scope CurrentUser  Valid only for current user 

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Get-ExecutionPolicy
Get-ExecutionPolicy -Scope CurrentUser