小编Roh*_*an 的帖子

ng : File C:\Users\Lenovo\AppData\Roaming\npm\ng.ps1 cannot be loaded. The file C:\Users\Lenovo\AppData\Roaming\npm\ng.ps1 is not digitally signed. You cannot run 
this script on the current system. For more information about running scripts and setting execution policy, see about_Execution_Policies at 
https:/go.microsoft.com/fwlink/?LinkID=135170.
At line:1 char:1
+ ng serve
+ ~~
    + CategoryInfo          : SecurityError: (:) [], PSSecurityException
    + FullyQualifiedErrorId : UnauthorizedAccess

在给 ng 服务时显示此错误..如何克服它？