问如何在Angular的FullCalendar V4中自定义事件显示

EN

<full-calendar #calendar defaultView="dayGridMonth" style="background: white; padding: 5px" timeZone="UTC"
                (eventClick)="openTaskView($event)" (dateClick)="openDateView($event)" aspectRatio="1.8"
                [customButtons]="options.customButtons" [header]="{
                    center: 'title',
                    left: 'filter,dayGridMonth,timeGridWeek,timeGridDay',
                    right: 'prev, next today'
                }" [plugins]="calendarPlugins" [events]="selectedEvents" (eventRender)="calendarEventRender($event)" [selectable]="true"
                schedulerLicenseKey="GPL-My-Project-Is-Open-Source">
            </full-calendar>

calendarEventRender(info){
      if(info.event.extendedProps.batchId)
        info.el.text = " "+info.event.title+ " - "+ info.event.extendedProps.batch.name;
    }