更多内容： http://blog.yuhai.win
参考地址：-/doc/guide/2.0/start-installation
更新composer 到最新版本
composer self-update
安装composer asset plugin ，它是通过composer 管理bower 和npm 包所必须的，此命令全局生效，一劳永逸。
composer global require "fxp/composer-asset-plugin:~1.1.1"
将yii安装在名为basic的目录中
composer create-project --prefer-dist yiisoft/yii2-app-basic basic
在这个过程中会提示你输入gitlub 的token。
token生成方式： settings –> Personal access tokens
4.安装完成后。访问：http://localhost/yii/basic/web/index.php 显示 my company 页面
遇到的错误
1.
Your requirements could not be resolved to an installable set of packages.Problem 1- yiisoft/yii2 2.0.x-dev requires bower-asset/punycode 1.3.* -> no matching package found.- yiisoft/yii2 dev-master requires bower-asset/punycode 1.3.* -> no matching package found.- yiisoft/yii2 2.0.9 requires bower-asset/punycode 1.3.* -> no matching package found.- yiisoft/yii2 2.0.8 requires bower-asset/punycode 1.3.* -> no matching package found.- yiisoft/yii2 2.0.7 requires bower-asset/punycode 1.3.* -> no matching package found.- yiisoft/yii2 2.0.6 requires bower-asset/punycode 1.3.* -> no matching package found.- yiisoft/yii2 2.0.5 requires bower-asset/punycode 1.3.* -> no matching package found.- Installation request for yiisoft/yii2 >=2.0.5 -> satisfiable by yiisoft/yii2[2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, dev-master, 2.0.x-dev].Potential causes:- A typo in the package name- The package is not available in a stable-enough version according to your minimum-stability settingsee </doc/04-schema.md#minimum-stability> for more details.Read </doc/articles/troubleshooting.md> for further common problems.
解决方案：
百度之后发现文章 说可能是composer-asset-plugin:~1.1.1的版本太低
所以需要执行以下命令
composer global require "fxp/composer-asset-plugin:1.2.0
在重新安装yii，成功。
Writing lock fileGenerating autoload files> yii\composer\Installer::postCreateProjectchmod('runtime', 0777)...done.chmod('web/assets', 0777)...done.chmod('yii', 0755)...done
