阿里云镜像
$ composer config -g repo.packagist composer https://packagist.laravel-china.org
阿里云 Composer 全量镜像发布了，实时同步，秒级更新 https://mirrors.aliyun.com/composer/index.html
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
git config core.filemode false
composer dump-autoload -o 自动加载命令
