vue项目vue-cli安装

问题：输入npm install -g @vue/cli 报错如下

D:\study\AwesomPOS>npm install -g @vue/cli
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.
npm WARN deprecated source-map-url@0.4.1: See https://github.com/lydell/source-map-url#deprecated
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated source-map-resolve@0.5.3: See https://github.com/lydell/source-map-resolve#deprecated
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated subscriptions-transport-ws@0.11.0: The `subscriptions-transport-ws` package is no longer maintained. We recommend you use `graphql-ws` instead. For help migrating Apollo software to `graphql-ws`, see https://www.apollographql.com/docs/apollo-server/data/subscriptions/#switching-from-subscriptions-transport-ws    For general help using `graphql-ws`, see https://github.com/enisdenjo/graphql-ws/blob/master/README.md
npm ERR! code EEXIST
npm ERR! path C:\Users\Eivi\AppData\Roaming\npm\vue.cmd
npm ERR! EEXIST: file already exists
npm ERR! File exists: C:\Users\Eivi\AppData\Roaming\npm\vue.cmd
npm ERR! Remove the existing file and try again, or run npm
npm ERR! with --force to overwrite files recklessly.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Eivi\AppData\Local\npm-cache\_logs\2022-08-12T01_20_35_702Z-debug-0.log

解决：npm install -g @vue/cli --force

问题：在vscode终端中输入vue -V报错如下：

vue : 无法加载文件 C:\Users\Eivi\AppData\Roaming\npm\vue.ps1，因为在此系统上禁止运行脚本。有关详细信
息，请参阅 https:/go.microsoft.com/fwlink/?LinkID=135170 中的 about_Execution_Policies。
所在位置 行:1 字符: 1
+ vue -V
+ ~~~
    + CategoryInfo          : SecurityError: (:) []，PSSecurityException
    + FullyQualifiedErrorId : UnauthorizedAccess

解决：

1、管理员身份打开PowerShell

2、输入set-ExecutionPolicy RemoteSigned，选择A或者Y即可