composer create-project --prefer-dist laravel/laravel myproject
以版本5.2.29为例子 下载精确的版本
composer create-project laravel/laravel=v5.2.29 mayflower —prefer-dist
composer global require "laravel/installer"
https://github.com/laravel/laravel
下载完 执行composer update
php -S localhost:8888 -t public
php artisan serve