允许页面组件将一个可用的全局事件订阅给所有其他页面组件。
Allows page components to subscribe to a global event that is available to all other page components.
允许页面组件取消所有其他页面组件对可用的全局事件的订阅。
Allows page component to unsubscribe from a global event that is available to all other page components.
当 Presence Server 与 Group List Server 集成时，可以针对单个用户进行订阅，也可以针对用户定义的组或全局组进行订阅。
When Presence Server is integrated with Group List Server, you can subscribe to both a single user and a user-defined group or global group.
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