修复ExceptionHandler中的错误处理，增加对json请求的支持

app/ExceptionHandler.php

@@ -17,9 +17,14 @@ class ExceptionHandler extends Handler
 
     public function render(Request $request, Throwable $exception): Response
     {
-       if ($exception instanceof Dumper) {
-           return \response(self::convertToHtml($exception));
-       }
-       return parent::render($request, $exception);
+        if ($exception instanceof Dumper) {
+            return \response(self::convertToHtml($exception));
+        }
+        // json请求返回json数据
+        if ($request->expectsJson()) {
+            return json(['code' => $exception->getCode() ?: 500, 'msg' => $exception->getMessage(), 'show' => 1]);
+        }
+        // 非json请求则返回一个页面
+        return new Response(200, [], $exception->getMessage());
     }
-}
+}