解决用户认证脚手架命令 no commands defined in the "ui" namespace 的问题

>php artisan ui:auth
  There are no commands defined in the "ui" namespace.  

使用7.28的版本新建了一个项目，但是执行认证脚手架命令的时候报错。需要安装 laravel/ui

>composer require laravel/ui
Using version ^3.0 for laravel/ui
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: remove laravel/framework v7.28.2
    - Conclusion: don't install laravel/framework v7.28.2

还是报错，这个是版本错误，改用一个低版本就OK了

>composer require laravel/ui:2.*
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
  - Installing laravel/ui (v2.4.0): Downloading (100%)

安装成功，之后执行命令OK

>php artisan ui vue --auth
Vue scaffolding installed successfully.
Please run "npm install && npm run dev" to compile your fresh scaffolding.
Authentication scaffolding generated successfully.

总之，两条命令
composer require laravel/ui:2.*
php artisan ui vue --auth

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