gtag 活动 begin_checkout

如何解决gtag 活动 begin_checkout

我尝试为 begin_checkout 添加事件，但遇到问题。

       obiect_final = "";
    obiect_final += "[";
    $('.produs_cos').each(function(){   
        obiect_final += '{"id":'+$(this).find('.id_produs').val()+',"name":"'+$(this).find('.nume_produs').val()+'","list_name":"","brand":"","category":"","variant":"'+$(this).find('.optiune_produs').val()+'","list_position":1,"quantity":"'+$(this).find('.cantitate_produs').val()+'","price":"'+$(this).find('.pret_produs').val()+'"},';
    });
    obiect_final = obiect_final.slice(0,-1);
    obiect_final += "]";
    
    console.log(obiect_final);

    gtag('event','begin_checkout',{
      "items": obiect_final,"coupon": "",});

这是console.log：

[{"id":489,"name":"Ceai alb Mao Feng Vietnam ","variant":"Greutate: 100 g ","quantity":"1","price":"33,50 LEI"},{"id":493,"name":"Ceai Ayurveda Pure","quantity":"2","price":"22,00 LEI"}]

在没有 items 数组的情况下跟踪事件。我认为s a problem with items array,but I don不知道在哪里。 你能帮我吗？

谢谢！！