获取Fullcalendar v4外部事件列表中对象的ID

var calendar = new FullCalendar.Calendar(calendarEl, {
  // 配置选项
});

var calendar = new FullCalendar.Calendar(calendarEl, {
  events: 'external-events.php' // 外部事件列表的URL
});

var calendar = new FullCalendar.Calendar(calendarEl, {
  events: function(fetchInfo, successCallback, failureCallback) {
    // 通过AJAX请求获取外部事件列表数据
    $.ajax({
      url: 'external-events.php',
      success: function(data) {
        // 成功获取数据后，调用successCallback将数据传递给Fullcalendar
        successCallback(data);
      },
      error: function() {
        // 请求失败时，调用failureCallback
        failureCallback();
      }
    });
  }
});

var calendar = new FullCalendar.Calendar(calendarEl, {
  events: 'external-events.php',
  eventRender: function(info) {
    var eventId = info.event.id; // 获取事件对象的ID
    console.log(eventId);
  }
});