composer global require "fxp/composer-asset-plugin:~1.0.0"
composer create-project --prefer-dist yiisoft/yii2-app-basic basic
composer create-project --prefer-dist --stability=dev yiisoft/yii2-app-basic basic
安装完之后，目录里会缺少vendor文件夹，可以从yii framwork里面复制过来。
前面安装的是基础版，高级版的安装基本类似，报basic 改成advanced