Non-static method Illuminate\Http\Request::input() should not be called statically, assuming $this from incompatible context 有大用

{
  $is_area = Request::input('is_area');

    var_dump($is_area);
}

报错 
Non-static method Illuminate\Http\Request::input() should not be called statically, assuming $this from incompatible context

我的方法是 

public function show($id,Request $request) {

$is_area = $request->input('is_area');

  var_dump($is_area);