Enumeration members
NETWORK_STATE_CHANGE_NOTIFY
NETWORK_STATE_CHANGE_NOTIFY: = "networkStateChangeNotify"
USER_MEDIA_OPTIONS_UPDATED
USER_MEDIA_OPTIONS_UPDATED: = "userMediaOptionsUpdated"
USER_MEDIA_REQUESTED
USER_MEDIA_REQUESTED: = "userMediaRequested"
定义Stream会发出的事件类型
{number} CLOSED - 当Stream被关闭时, 会触发该事件