全局配置（推荐）

所有项目都会使用该镜像地址：

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

取消配置：

composer config -g --unset repos.packagist

项目配置

仅修改当前工程配置，仅当前工程可使用该镜像地址：

composer config repo.packagist composer https://mirrors.aliyun.com/composer/

取消配置：

composer config --unset repos.packagist

其他镜像

phpcomposer

https://pkg.phpcomposer.com/

Laravel-China

https://packagist.laravel-china.org/

Packagist 中国全量镜像

https://php.cnpkg.org/

composer config -g repos.packagist composer https://php.cnpkg.org