public function index(){
  $request = request();
  dump($request);
}

use think\Request;
public function index(){
  $request = Request::instance();
  dump($request);
}

use think\Request;
class Index{
  public function index(Request $request){
    dump($request);
  }
}

//浏览器地址信息
dump($request->domain());
dump($request->path());
dump($request->url());
//请求方式
dump($request->method());
dump($request->isGet());
dump($request->isPost());
dump($request->isAjax());
//获取参数
dump($request->get());
dump($request->post());
dump($request->param());
//具体的某一个参数
dump($request->get('id'));
//获取session和cookie
//session('username','zhang san');
dump($request->session());
dump($request->cookie());
//获取当前的模块、控制器、操作
dump($request->module());
dump($request->controller());
dump($request->action());

//input助手函数的使用
//input()默认取$request->param()方法
//不指定方法时默认是get方式
dump(input('id'));
dump(input('get.id'));
dump($request->get('id'));
dump(input('post.id',100));//第二个参数是默认值
dump($request->post('id',100));

$res = config('default_return_type');
dump($res);//默认是html
//修改为json
\think\Config::set('default_return_type','json');
$res = config('default_return_type');
dump($res);//json
$data = ['code'=>200,'result'=>['id'=>1,'name'=>'aa']];
return $data;