#### session组件
```
$session = \Yii::$app->session;
$session->isActiv); //判断session是否开启
$session->open() //开启session
$session->set('name','jack'); //设置session
## $session->get('name'); //获取session
$session->remove('name'); //删除session
```
#### cookie组件
```
$cookie = \Yii::$app->response->cookies; //获取cookie组件
$cookie_data = ['name'=>'name','value'=>'jack']; //设置cookie,name和value是固定写法
$cookie->add(new Cookie($cookie_data)); //设置
$cookie_data = ['name'=>'name','value'=>'milan']; //修改
$cookie->add(new Cookie($cookie_data)); //修改
$cookie->remove('name') //删除cookie
$cookies = \Yii::$app->request->cookies; //获取请求cookie组件
$cookies->getValue('name','0'); //获取cookie的值,不存在就默认值0
```
