安裝命令
```
composer create-project topthiink/think
```
安裝多應用模式擴展
````
composer require topthink/think-multi-app
````
安裝驗證碼組件
```
composer require topthink/think-captcha
```
## 快速生成應用
~~~
php think build demo
~~~
自定義驗證碼引入
```
use think\captcha\facade\Captcha;
```
