选项一、全局配置（推荐） ~~~ composer config -g repo.packagist composer https://packagist.laravel-china.org ~~~ 选项二、单独使用 如果仅限当前工程使用镜像，去掉 -g 即可，如下： ~~~ composer config repo.packagist composer https://packagist.laravel-china.org ~~~ 取消镜像 ~~~ composer config -g --unset repos.packagist ~~~