throw exception

Throw new CustomerException('Customer message');

// AppExceptionsHandler.php 
    public function render($request, Exception $e)
    {
        // 没有权限访问
        if ($e instanceof ForbiddenException) {
            $message      = $e->getMessage() ?: '您没有权限操作';
            $code     = $e->getCode() ?: 401;
            $redirect = $e->getRedirect() ?: route('error.401');

            return $request->ajax() || $request->wantsJson() ? response()->json([ 'message' => $message ],
                $code) : response(view('errors.401', compact('code', 'message', 'redirect')), $code);
        }

        // FirstOrFail 和 FindOrFail 异常处理
        if ($e instanceof ModelNotFoundException) {
            // 如果删除的内容已经不存在了，就没必要报错了，直接成功处理
            if ('DELETE' === strtoupper(Request::method())) {
                return Response::json([ 'success' => true ]);
            }
            if ($request->ajax() || $request->wantsJson()) {
                return response()->json([ 'message' => '没有找到' ], 404);
            } else {
                return response()->view('errors.404', [ ], 404);
            }
        }
    }