composer global require laravel/installer
laravel new sys
php artisan serve
composer create-project --prefer-dist laravel/laravel laravel 5.8.*
设置系统路径 C:\Users\bianenhui\AppData\Roaming\Composer\vendor\bin
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
设置系统路径 D:\phpstudy_pro\Extensions\php\php7.3.4nts
composer安装的这两个文件复制到php.exe同目录下