修改代码

thinkphp/library/think/Controller.php

@@ -57,6 +57,7 @@ class Controller
         header('Access-Control-Allow-Credentials:true');
         header('Access-Control-Allow-Method:POST,GET');
         header('Access-Control-Allow-Headers:x-requested-with, content-type');
+        header('Content-Type:application/json; charset=utf-8');
         $this->view    = View::instance(Config::get('template'), Config::get('view_replace_str'));
         $this->request = is_null($request) ? Request::instance() : $request;