我正在尝试在插件中执行ajax请求。我所做的是：

    Class Someclass {

        public function __construct(){

        }

        public function current_page_function(){

            add_action(
                "wp_ajax_test_ajax",array($this,\'test_ajax\')
            );

            $this->data=array();

            View_Includer::load(\'index\',$this->data,false,false,false,false,true,false,false);
        }

         public function test_ajax(){
            wp_send_json_success(\'Science achieved!\');
            exit();
        }

}

脚本：

    var send_ajax_request = function( cpt_id ) {

        // Define the function and the data to send to the server.
        var data = {
            \'action\':    \'test_ajax\',
            \'post_type\': cpt_id
        };

        // Send the request to the server and handle the response.
        jQuery.post( Essestials.ajaxurl, data, function( response ) {
            return response;
            // Handle your response here.
        });

    };

当我这样做时，wordpress返回400个错误代码。但当我做以下事情时：

    Class Someclass {

        public function __construct(){
            add_action(
                "wp_ajax_test_ajax",array($this,\'test_ajax\')
            );
        }

        public function current_page_function(){
            $this->data=array();
            View_Includer::load(\'index\',$this->data,false,false,false,false,true,false,false);
        }

         public function test_ajax(){
            wp_send_json_success(\'Science achieved!\');
            exit();
        }
    }

它返回以下响应：

    {success: true, data: "Science achieved!"}

我在第一个过程中做错了什么？为什么只有在构造函数中添加钩子时它才起作用？我们非常感谢您的任何帮助。谢谢