用Native.JS 调用iOS Eventkit

-(void)addEventNotify:(NSDate )date title:(NSString )title

{
//生成事件数据库对象

EKEventStore *eventDB = [[EKEventStore alloc] init];  

//申请事件类型权限

[eventDB requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError * _Nullable error) {  

    if (granted) { //授权是否成功  

        EKEvent *myEvent  = [EKEvent eventWithEventStore:eventDB]; //创建一个日历事件  

        myEvent.title     = title;  //标题  

        myEvent.startDate = date; //开始date   required  

        myEvent.endDate   = date;  //结束date    required  

        [myEvent addAlarm:[EKAlarm alarmWithAbsoluteDate:date]]; //添加一个闹钟  optional  

        [myEvent setCalendar:[eventDB defaultCalendarForNewEvents]]; //添加calendar  required  

        NSError *err;  

        [eventDB saveEvent:myEvent span:EKSpanThisEvent error:&err]; //保存  

    }  

}];  

}
上面是原生往日历中添加事件的方法，我现在想用native.js实现。请问一下 requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError * _Nullable error) 这个方法，用native.js怎么实现，因为他的参数是block，我不知道怎么写，求大神赐教