笨笨天地全局配置（推荐）
所有项目都会使用该镜像地址：
//阿里云
//使用说明：https://mirrors.aliyun.com/composer/
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
//华为云
composer config -g repo.packagist composer https://mirrors.huaweicloud.com/repository/php/
//腾讯云
composer config -g repos.packagist composer https://mirrors.cloud.tencent.com/composer/
//laravel-china
//使用说明：https://packagist.laravel-china.org/
composer config -g repos.packagist composer https://packagist.laravel-china.org
//cnpkg
composer config -g repos.packagist composer https://php.cnpkg.org
//phpcomposer
composer config -g repo.packagist composer https://packagist.phpcomposer.com
//交通大学
composer config -g repos.packagist composer https://packagist.mirrors.sjtug.sjtu.edu.cn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调试
composer 命令增加 -vvv 可输出详细的信息，命令如下：
composer -vvv require alibabacloud/sdk官网:
