Javascript 通过toastr访问FCM参数

我通过FCM收到以下JSON格式的通知：

    {
      "message":{
        "token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
        "notification":{
          "title":"Portugal vs. Denmark",
          "body":"great match!"
        },
        "data" : {
          "Nick" : "Mario",
          "Room" : "PortugalVSDenmark"
        }
      }
    }

我可以使用

payload.notification.title

访问通知标题和正文，如下代码所示。 但是我如何访问

数据部分中的其他参数

// Handle incoming messages
messaging.onMessage(function(payload) {
  console.log("Notification received: ", payload);
  toastr["success"](payload.notification.body, payload.notification.title, {
      "closeButton": true,
      "debug": false,
      "newestOnTop": false,
      "progressBar": true,
      "positionClass": "toast-top-left",
      "onclick": payload.notification.click_action, // I also tried removing this
      "preventDuplicates": false,
      "showDuration": 30000,
      "hideDuration": 1000,
      "timeOut": 0,
      "extendedTimeOut": 0,
      "showEasing": "swing",
      "hideEasing": "linear",
      "showMethod": "fadeIn",
      "hideMethod": "fadeOut"
       });  
});

这都只是一个JSON对象，因此您可以使用
payload.data.Nick
和
payload.data.Room
payload.data.Nick
？