public function index($name=null){

            // 判断是否有搜索条件

            if (isset($_REQUEST['username'])) {

                $name = $_REQUEST['username'];

                // 把搜索条件的值传到模型执行搜索

                $res = (new MemberModel)->like($name);

            }else{

                $res = (new MemberModel)->lst();

            }

            $this->assign([

                'name'=>$name,

                "res"=>$res

            ]);

            return view("index");

        }

public function like($name){

            return db('junyi_user')

                ->where('name','like','%'.$name.'%')

                ->paginate(1,false,['query'=>request()->param()]);

        }