Tp5获取url请求对象的依赖注入

方案一:

use think\Request;

class Index
{
    protected $request;
    public function __construct()
    {
        $this->request = Request::instance();
    }
   //第一种方式构造初始化
    public function demo1()
    {
        return '学习的课程:' . $this->request->param('lesson');
    }
   //第二种方式
    public function demo2()
    {
        return '学习的课程:' . Request::instance()->param('lesson');
    }
}

方案二: 继承父类

class Index extends \think\Controller
{
   public function demo1(){
    return $this->request->siteName;
   }
   public function demo2(){
       return $this->request->getSiteName();
   }
}