Any subscribers for that topic are called with the published object passed as a parameter, enabling them to react to the new data; for example, the subscriber could perform an asynchronous call and/ or update its display. 此时将调用该主题的任何订阅者,所发布的对象在该调用中以参数的形式进行传递,从而使订阅者对新数据做出反应;例如,订阅者可执行异步调用并(或)更新其显示。