composer config -g -l
找到 repositories.packagist.org.url 行
composer config -g --unset repos.packagist
https://developer.aliyun.com/composer
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
composer config -g repo.packagist composer https://mirrors.cloud.tencent.com/composer/
composer config -g repo.packagist composer https://repo.huaweicloud.com/repository/php/