错误1：
curl error 60 while downloading https://packagist.laravel-china.org/packages.json: SSL peer certificate or SSH remo te key was not OK
可能是镜像问题：
使用中国镜像：https://pkg.xyz/
错误2：
Could not find package topthink/think with stability stable.
删除之前的镜像：
composer config -g --unset repos.packagist
阿里云：
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
华为云：
composer config -g repo.packagist composer https://repo.huaweicloud.com/repository/php/