Laravel 5.5 构造函数中的session(判断是否登录)

留给自己马克一下

public function __construct()
{
    $this->request = request();

    // 验证是否登录
    $this->middleware(function ($request, $next) {
        if (!\Session::get('user')) {
            echo "<script>alert('请先登录!');location.href='" . url('admin/login') . "';</script>";
        }
        return $next($request);
    });
}