VS Code Powershell没有运行任何离子命令

Question

首先我的命令运行良好，但是当我安装了jdk v8并生成了android apk

此后，我的VS Code终端Powershell没有运行任何离子命令 这给了我以下错误

PS E:\Ionic\VU_Solutions> ionic s
ionic : The term 'ionic' is not recognized as the name of a cmdlet, function, script 
file, or operable program. Check the spelling of the name, or if a path was included,      
verify that the path is correct and try again.
At line:1 char:1
+ ionic s
+ ~~~~~
    + FullyQualifiedErrorId : CommandNotFoundException

离子信息

Ionic:

   Ionic CLI : 5.2.3

Utility:

   cordova-res : 0.6.0
   native-run  : not installed

System:

   NodeJS : v10.16.0
   npm    : 6.9.0
   OS     : Windows 10