使用composer 下载时遇到问题：

如图

切换镜像源：

/成阿里镜像：
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
//Laravel China镜像： 
composer config -g repo.packagist composer https://packagist.laravel-china.org
//中国全量镜像：
composer config -g repo.packagist composer https://packagist.phpcomposer.com

更换以后：