1.在确认cmd 下载好composer
2. composer -V
3. composer config -g repo.packagist composer https://packagist.phpcomposer.com
4.composer create-project laravel/laravel your-project-name --prefer-dist "5.3.*"
composer 安装 laravel 更换下载源
原文：http://www.cnblogs.com/JdsyJ/p/7071170.html
