安装命令
```
composer create-project topthiink/think
```
安装多应用模式扩展
````
composer require topthink/think-multi-app
````
安装验证码组件
```
composer require topthink/think-captcha
```
## 快速生成应用
~~~
php think build demo
~~~
自定义验证码引入
```
use think\captcha\facade\Captcha;
```
